XML 60 R50.htm IDEA: XBRL DOCUMENT
v3.23.1

ORGANIZATION AND DESCRIPTION OF BUSINESS - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Details) - USD ($) shares in Thousands, $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 26, 2022 | Mar. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ (28,401) |  | $ 824,524 |  |  |  | $ (28,401) |
Net loss | (37,061) | $ (43,378) | (33,844) | $ 11,772 | $ 6,743 | $ (77,222) |  | $ 18,515
Issuance of common stock in connection with Merger, net of offering costs, underwriting discounts and commissions |  | 661 |  |  |  |  |  |
Issuance of common stock in connection with the acquisition of business |  | 25,500 |  |  |  |  |  |
Conversion of Class D shares to Class A shares |  | (1) |  |  |  |  |  |
Exercise of warrants |  |  | 27,989 |  |  |  |  |
Net deferred tax liability resulting from changes in outside basis difference on investment in S1 Holdco, LLC |  | (2,596) |  |  |  |  |  |
Other comprehensive income | 87 | (81) | (538) | 24 | 441 |  |  |
Share-based compensation | 23,705 | 31,398 | 6,995 | 120 | 146 |  |  |
Distribution to members |  | (247) | (1,254) |  |  |  |  |
Ending balance |  | 824,524 | 823,872 |  |  | 823,872 | 823,872 |
Previously Reported |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 466,211 |  |  |  | 466,211 |  |
Net loss | (40,460) |  | (34,065) |  |  | (72,124) |  |
Ending balance | 466,211 |  | 827,123 |  |  | 827,123 | 827,123 |
Previously Reported, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 466,400 |  | $ 829,718 |  | 466,400 |  |
Net loss |  | (38,059) | (34,065) |  |  |  |  |
Issuance of common stock in connection with the acquisition of business |  | 25,500 |  |  |  |  |  |
Conversion of Class D shares to Class A shares |  | (1) |  |  |  |  |  |
Exercise of warrants |  |  | 27,989 |  |  |  |  |
Net deferred tax liability resulting from changes in outside basis difference on investment in S1 Holdco, LLC |  | (6,752) | 585 |  |  |  |  |
Other comprehensive income |  | (34) | 262 |  |  |  |  |
Share-based compensation |  | 27,167 | 3,888 |  |  |  |  |
Distribution to members |  | (247) | (1,254) |  |  |  |  |
Ending balance | 466,400 |  | 827,123 |  | $ 829,718 | 827,123 | 827,123 |
Previously Reported, Error Correction Adjustemnt |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (189) |  |  |  | (189) |  |
Ending balance | (189) |  |  |  |  |  |  |
Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 347,055 |  |  |  | 347,055 |  |
Ending balance | 347,055 |  |  |  |  |  |  |
Revision of Prior Period, Adjustment, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 355,742 |  |  |  | 355,742 |  |
Ending balance | 355,742 |  |  |  |  |  |  |
Revision of Prior Period, Adjustment, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (8,687) |  |  |  | (8,687) |  |
Ending balance | (8,687) |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 813,266 |  |  |  | 813,266 |  |
Ending balance | 813,266 |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 822,142 |  |  |  | 822,142 |  |
Ending balance | 822,142 |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (8,876) |  |  |  | (8,876) |  |
Ending balance | (8,876) |  |  |  |  |  |  |
Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | (5,194) |  |  |  |  |
Net loss | $ 3,399 |  | 221 |  |  | (5,098) |  |
Ending balance |  | (5,194) | (3,251) |  |  | $ (3,251) | $ (3,251) |
Revision of Prior Period, Error Correction, Adjustment A, G, I, J, K, L, M, O |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss |  | (5,319) |  |  |  |  |  |
Revision of Prior Period, Error Correction, Adjustment G |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of common stock in connection with Merger, net of offering costs, underwriting discounts and commissions |  | 661 |  |  |  |  |  |
Revision of Prior Period, Error Correction, Adjustment M |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net deferred tax liability resulting from changes in outside basis difference on investment in S1 Holdco, LLC |  | 4,156 | (585) |  |  |  |  |
Revision of Prior Period, Error Correction, Adjustment P |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive income |  | (47) | (800) |  |  |  |  |
Revision of Prior Period, Error Correction, Adjustment G, H |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Share-based compensation |  | $ 4,231 | 3,107 |  |  |  |  |
Revision of Prior Period, Error Correction, Adjustment G, I |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss |  |  | $ 221 |  |  |  |  |
Common Stock | Class A units of S1 Holdco |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  |  | 86,597 |  |  |  |  |
Beginning balance |  |  | $ 9 |  |  |  |  |
Issuance of common stock in connection with Merger, net of offering costs, underwriting discounts and commissions (in shares) |  | 930 |  |  |  |  |  |
Issuance of common stock in connection with the acquisition of business (in shares) |  | 2,000 |  |  |  |  |  |
Conversion of Class D shares to Class A shares (in shares) |  | 2,900 |  |  |  |  |  |
Conversion of Class D shares to Class A shares |  | $ (1) |  |  |  |  |  |
Exercise of warrants (in shares) |  |  | 3,969 |  |  |  |  |
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares) |  |  | 21 |  |  |  |  |
Ending balance (in shares) |  | 86,597 | 90,587 |  |  | 90,587 | 90,587 |
Ending balance |  | $ 9 | $ 9 |  |  | $ 9 | $ 9 |
Common Stock | Class A units of S1 Holdco | Previously Reported |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 51,750 |  |  |  | 51,750 |  |
Beginning balance |  | $ 5 |  |  |  | $ 5 |  |
Ending balance (in shares) | 51,750 |  |  |  |  |  |  |
Ending balance | $ 5 |  |  |  |  |  |  |
Common Stock | Class A units of S1 Holdco | Previously Reported, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 52,680 |  | 86,597 |  | 52,680 |  |
Beginning balance |  | $ 5 |  | $ 9 |  | $ 5 |  |
Issuance of common stock in connection with the acquisition of business (in shares) |  | 2,000 |  |  |  |  |  |
Conversion of Class D shares to Class A shares (in shares) |  | 2,900 |  |  |  |  |  |
Conversion of Class D shares to Class A shares |  | $ (1) |  |  |  |  |  |
Exercise of warrants (in shares) |  |  | 3,969 |  |  |  |  |
Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares) |  |  | 21 |  |  |  |  |
Ending balance (in shares) | 52,680 |  | 90,587 |  | 86,597 | 90,587 | 90,587 |
Ending balance | $ 5 |  | $ 9 |  | $ 9 | $ 9 | $ 9 |
Common Stock | Class A units of S1 Holdco | Previously Reported, Error Correction Adjustemnt |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | (930) |  |  |  | (930) |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | (930) |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class A units of S1 Holdco | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 29,017 |  |  |  | 29,017 |  |
Beginning balance |  | $ 3 |  |  |  | $ 3 |  |
Ending balance (in shares) | 29,017 |  |  |  |  |  |  |
Ending balance | $ 3 |  |  |  |  |  |  |
Common Stock | Class A units of S1 Holdco | Revision of Prior Period, Adjustment, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 29,017 |  |  |  | 29,017 |  |
Beginning balance |  | $ 3 |  |  |  | $ 3 |  |
Ending balance (in shares) | 29,017 |  |  |  |  |  |  |
Ending balance | $ 3 |  |  |  |  |  |  |
Common Stock | Class A units of S1 Holdco | Revision of Prior Period, Adjustment, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 0 |  |  |  | 0 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 0 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class A units of S1 Holdco | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 80,767 |  |  |  | 80,767 |  |
Beginning balance |  | $ 8 |  |  |  | $ 8 |  |
Ending balance (in shares) | 80,767 |  |  |  |  |  |  |
Ending balance | $ 8 |  |  |  |  |  |  |
Common Stock | Class A units of S1 Holdco | Cumulative Effect, Period of Adoption, Adjusted Balance, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 81,697 |  |  |  | 81,697 |  |
Beginning balance |  | $ 8 |  |  |  | $ 8 |  |
Ending balance (in shares) | 81,697 |  |  |  |  |  |  |
Ending balance | $ 8 |  |  |  |  |  |  |
Common Stock | Class A units of S1 Holdco | Cumulative Effect, Period of Adoption, Adjusted Balance, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | (930) |  |  |  | (930) |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | (930) |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class A units of S1 Holdco | Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  |  | 0 |  |  |  |  |
Beginning balance |  |  | $ 0 |  |  |  |  |
Ending balance (in shares) |  | 0 | 0 |  |  | 0 | 0 |
Ending balance |  | $ 0 | $ 0 |  |  | $ 0 | $ 0 |
Common Stock | Class A units of S1 Holdco | Revision of Prior Period, Error Correction, Adjustment G |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of common stock in connection with Merger, net of offering costs, underwriting discounts and commissions (in shares) |  | 930 |  |  |  |  |  |
Common Stock | Class C Common Stock |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  |  | 22,077 |  |  |  |  |
Beginning balance |  |  | $ 2 |  |  |  |  |
Ending balance (in shares) |  | 22,077 | 22,077 |  |  | 22,077 | 22,077 |
Ending balance |  | $ 2 | $ 2 |  |  | $ 2 | $ 2 |
Common Stock | Class C Common Stock | Previously Reported |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 0 |  |  |  | 0 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 0 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class C Common Stock | Previously Reported, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 0 |  | 22,077 |  | 0 |  |
Beginning balance |  | $ 0 |  | $ 2 |  | $ 0 |  |
Ending balance (in shares) | 0 |  | 22,077 |  | 22,077 | 22,077 | 22,077 |
Ending balance | $ 0 |  | $ 2 |  | $ 2 | $ 2 | $ 2 |
Common Stock | Class C Common Stock | Previously Reported, Error Correction Adjustemnt |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 0 |  |  |  | 0 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 0 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class C Common Stock | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 22,077 |  |  |  | 22,077 |  |
Beginning balance |  | $ 2 |  |  |  | $ 2 |  |
Ending balance (in shares) | 22,077 |  |  |  |  |  |  |
Ending balance | $ 2 |  |  |  |  |  |  |
Common Stock | Class C Common Stock | Revision of Prior Period, Adjustment, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 22,077 |  |  |  | 22,077 |  |
Beginning balance |  | $ 2 |  |  |  | $ 2 |  |
Ending balance (in shares) | 22,077 |  |  |  |  |  |  |
Ending balance | $ 2 |  |  |  |  |  |  |
Common Stock | Class C Common Stock | Revision of Prior Period, Adjustment, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 0 |  |  |  | 0 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 0 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class C Common Stock | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 22,077 |  |  |  | 22,077 |  |
Beginning balance |  | $ 2 |  |  |  | $ 2 |  |
Ending balance (in shares) | 22,077 |  |  |  |  |  |  |
Ending balance | $ 2 |  |  |  |  |  |  |
Common Stock | Class C Common Stock | Cumulative Effect, Period of Adoption, Adjusted Balance, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 22,077 |  |  |  | 22,077 |  |
Beginning balance |  | $ 2 |  |  |  | $ 2 |  |
Ending balance (in shares) | 22,077 |  |  |  |  |  |  |
Ending balance | $ 2 |  |  |  |  |  |  |
Common Stock | Class C Common Stock | Cumulative Effect, Period of Adoption, Adjusted Balance, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 0 |  |  |  | 0 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 0 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class C Common Stock | Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  |  | 0 |  |  |  |  |
Beginning balance |  |  | $ 0 |  |  |  |  |
Ending balance (in shares) |  | 0 | 0 |  |  | 0 | 0 |
Ending balance |  | $ 0 | $ 0 |  |  | $ 0 | $ 0 |
Common Stock | Class D Common Stock |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  |  | 0 |  |  |  |  |
Beginning balance |  |  | $ 0 |  |  |  |  |
Issuance of market-based restricted stock units upon vesting |  | 1,450 |  |  |  |  |  |
Conversion of Class D shares to Class A shares |  | $ (2,900) |  |  |  |  |  |
Ending balance (in shares) |  | 0 | 0 |  |  | 0 | 0 |
Ending balance |  | $ 0 | $ 0 |  |  | $ 0 | $ 0 |
Common Stock | Class D Common Stock | Previously Reported |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 0 |  |  |  | 0 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 0 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class D Common Stock | Previously Reported, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 0 |  | 0 |  | 0 |  |
Beginning balance |  | $ 0 |  | $ 0 |  | $ 0 |  |
Conversion of Class D shares to Class A shares |  | $ (2,900) |  |  |  |  |  |
Ending balance (in shares) | 0 |  | 0 |  | 0 | 0 | 0 |
Ending balance | $ 0 |  | $ 0 |  | $ 0 | $ 0 | $ 0 |
Common Stock | Class D Common Stock | Previously Reported, Error Correction Adjustemnt |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 0 |  |  |  | 0 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 0 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class D Common Stock | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 1,450 |  |  |  | 1,450 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 1,450 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class D Common Stock | Revision of Prior Period, Adjustment, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 2,900 |  |  |  | 2,900 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 2,900 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class D Common Stock | Revision of Prior Period, Adjustment, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | (1,450) |  |  |  | (1,450) |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | (1,450) |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class D Common Stock | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 1,450 |  |  |  | 1,450 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 1,450 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class D Common Stock | Cumulative Effect, Period of Adoption, Adjusted Balance, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | 2,900 |  |  |  | 2,900 |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | 2,900 |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class D Common Stock | Cumulative Effect, Period of Adoption, Adjusted Balance, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  | (1,450) |  |  |  | (1,450) |  |
Beginning balance |  | $ 0 |  |  |  | $ 0 |  |
Ending balance (in shares) | (1,450) |  |  |  |  |  |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Common Stock | Class D Common Stock | Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  |  | 0 |  |  |  |  |
Beginning balance |  |  | $ 0 |  |  |  |  |
Ending balance (in shares) |  | 0 | 0 |  |  | 0 | 0 |
Ending balance |  | $ 0 | $ 0 |  |  | $ 0 | $ 0 |
Common Stock | Class D Common Stock | Revision of Prior Period, Error Correction, Adjustment G |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of common stock in connection with the acquisition of business (in shares) |  | 1,450 |  |  |  |  |  |
Additional Paid-In-Capital |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 777,325 |  |  |  |  |
Issuance of common stock in connection with Merger, net of offering costs, underwriting discounts and commissions |  | $ 661 |  |  |  |  |  |
Issuance of common stock in connection with the acquisition of business |  | 25,500 |  |  |  |  |  |
Exercise of warrants |  |  | 27,989 |  |  |  |  |
Net deferred tax liability resulting from changes in outside basis difference on investment in S1 Holdco, LLC |  | (2,596) |  |  |  |  |  |
Share-based compensation |  | 31,398 | 6,995 |  |  |  |  |
Ending balance |  | 777,325 | 812,309 |  |  | 812,309 | 812,309 |
Additional Paid-In-Capital | Previously Reported |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 574,003 |  |  |  | 574,003 |  |
Ending balance | 574,003 |  |  |  |  |  |  |
Additional Paid-In-Capital | Previously Reported, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 525,579 |  | 728,540 |  | 525,579 |  |
Issuance of common stock in connection with the acquisition of business |  | 25,500 |  |  |  |  |  |
Exercise of warrants |  |  | 27,989 |  |  |  |  |
Net deferred tax liability resulting from changes in outside basis difference on investment in S1 Holdco, LLC |  | (6,752) | 585 |  |  |  |  |
Share-based compensation |  | 27,167 | 3,888 |  |  |  |  |
Ending balance | 525,579 |  | 761,002 |  | 728,540 | 761,002 | 761,002 |
Additional Paid-In-Capital | Previously Reported, Error Correction Adjustemnt |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 48,424 |  |  |  | 48,424 |  |
Ending balance | 48,424 |  |  |  |  |  |  |
Additional Paid-In-Capital | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 148,359 |  |  |  | 148,359 |  |
Ending balance | 148,359 |  |  |  |  |  |  |
Additional Paid-In-Capital | Revision of Prior Period, Adjustment, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 157,046 |  |  |  | 157,046 |  |
Ending balance | 157,046 |  |  |  |  |  |  |
Additional Paid-In-Capital | Revision of Prior Period, Adjustment, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (8,687) |  |  |  | (8,687) |  |
Ending balance | (8,687) |  |  |  |  |  |  |
Additional Paid-In-Capital | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 722,362 |  |  |  | 722,362 |  |
Ending balance | 722,362 |  |  |  |  |  |  |
Additional Paid-In-Capital | Cumulative Effect, Period of Adoption, Adjusted Balance, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 682,625 |  |  |  | 682,625 |  |
Ending balance | 682,625 |  |  |  |  |  |  |
Additional Paid-In-Capital | Cumulative Effect, Period of Adoption, Adjusted Balance, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 39,737 |  |  |  | 39,737 |  |
Ending balance | 39,737 |  |  |  |  |  |  |
Additional Paid-In-Capital | Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 48,785 |  |  |  |  |
Ending balance |  | 48,785 | 51,307 |  |  | 51,307 | 51,307 |
Additional Paid-In-Capital | Revision of Prior Period, Error Correction, Adjustment G |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of common stock in connection with Merger, net of offering costs, underwriting discounts and commissions |  | 661 |  |  |  |  |  |
Additional Paid-In-Capital | Revision of Prior Period, Error Correction, Adjustment M |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net deferred tax liability resulting from changes in outside basis difference on investment in S1 Holdco, LLC |  | 4,156 | (585) |  |  |  |  |
Additional Paid-In-Capital | Revision of Prior Period, Error Correction, Adjustment G, H |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Share-based compensation |  | 4,231 | 3,107 |  |  |  |  |
Accumulated Deficit |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | (143,866) |  |  |  |  |
Net loss |  | (36,069) | (25,737) |  |  |  |  |
Ending balance |  | (143,866) | (169,603) |  |  | (169,603) | (169,603) |
Accumulated Deficit | Previously Reported |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (107,797) |  |  |  | (107,797) |  |
Ending balance | (107,797) |  |  |  |  |  |  |
Accumulated Deficit | Previously Reported, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (59,184) |  | (89,175) |  | (59,184) |  |
Net loss |  | (29,991) | (29,198) |  |  |  |  |
Ending balance | (59,184) |  | (118,373) |  | (89,175) | (118,373) | (118,373) |
Accumulated Deficit | Previously Reported, Error Correction Adjustemnt |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (48,613) |  |  |  | (48,613) |  |
Ending balance | (48,613) |  |  |  |  |  |  |
Accumulated Deficit | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Deficit | Revision of Prior Period, Adjustment, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Deficit | Revision of Prior Period, Adjustment, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (107,797) |  |  |  | (107,797) |  |
Ending balance | (107,797) |  |  |  |  |  |  |
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjusted Balance, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (59,184) |  |  |  | (59,184) |  |
Ending balance | (59,184) |  |  |  |  |  |  |
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjusted Balance, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | (48,613) |  |  |  | (48,613) |  |
Ending balance | (48,613) |  |  |  |  |  |  |
Accumulated Deficit | Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | (54,691) |  |  |  |  |
Ending balance |  | (54,691) | (51,230) |  |  | (51,230) | (51,230) |
Accumulated Deficit | Revision of Prior Period, Error Correction, Adjustment A, G, I, J, K, L, M, O |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss |  | (6,078) |  |  |  |  |  |
Accumulated Deficit | Revision of Prior Period, Error Correction, Adjustment G, I |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss |  |  | 3,461 |  |  |  |  |
Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 103 |  |  |  |  |
Other comprehensive income | 87 | 103 | (524) | 24 | 441 |  |  |
Ending balance |  | 103 | (421) |  |  | (421) | (421) |
Accumulated Other Comprehensive Income | Previously Reported |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Other Comprehensive Income | Previously Reported, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  | (28) |  | 0 |  |
Other comprehensive income |  | (28) | 207 |  |  |  |  |
Ending balance | 0 |  | 179 |  | (28) | 179 | 179 |
Accumulated Other Comprehensive Income | Previously Reported, Error Correction Adjustemnt |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Other Comprehensive Income | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Other Comprehensive Income | Revision of Prior Period, Adjustment, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Other Comprehensive Income | Revision of Prior Period, Adjustment, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Other Comprehensive Income | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Other Comprehensive Income | Cumulative Effect, Period of Adoption, Adjusted Balance, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Other Comprehensive Income | Cumulative Effect, Period of Adoption, Adjusted Balance, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Accumulated Other Comprehensive Income | Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 131 |  |  |  |  |
Ending balance |  | 131 | (600) |  |  | (600) | (600) |
Accumulated Other Comprehensive Income | Revision of Prior Period, Error Correction, Adjustment P |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive income |  | 131 | (731) |  |  |  |  |
Non-Controlling Interest |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 190,951 |  |  |  |  |
Net loss |  | (7,309) | (8,107) |  |  |  |  |
Other comprehensive income |  | (184) | (14) |  |  |  |  |
Distribution to members |  | (247) | (1,254) |  |  |  |  |
Ending balance |  | 190,951 | 181,576 |  |  | 181,576 | 181,576 |
Non-Controlling Interest | Previously Reported |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Non-Controlling Interest | Previously Reported, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  | $ 190,370 |  | 0 |  |
Net loss |  | (8,068) | (4,867) |  |  |  |  |
Other comprehensive income |  | (6) | 55 |  |  |  |  |
Distribution to members |  | (247) | (1,254) |  |  |  |  |
Ending balance | 0 |  | 184,304 |  | $ 190,370 | 184,304 | 184,304 |
Non-Controlling Interest | Previously Reported, Error Correction Adjustemnt |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Non-Controlling Interest | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 198,691 |  |  |  | 198,691 |  |
Ending balance | 198,691 |  |  |  |  |  |  |
Non-Controlling Interest | Revision of Prior Period, Adjustment, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 198,691 |  |  |  | 198,691 |  |
Ending balance | 198,691 |  |  |  |  |  |  |
Non-Controlling Interest | Revision of Prior Period, Adjustment, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | 0 |  |  |  |  |  |  |
Non-Controlling Interest | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 198,691 |  |  |  | 198,691 |  |
Ending balance | 198,691 |  |  |  |  |  |  |
Non-Controlling Interest | Cumulative Effect, Period of Adoption, Adjusted Balance, Before Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 198,691 |  |  |  | 198,691 |  |
Ending balance | 198,691 |  |  |  |  |  |  |
Non-Controlling Interest | Cumulative Effect, Period of Adoption, Adjusted Balance, Including Error Correction |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  | 0 |  |
Ending balance | $ 0 |  |  |  |  |  |  |
Non-Controlling Interest | Revision of Prior Period, Error Correction, Adjustment |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 581 |  |  |  |  |
Ending balance |  | 581 | (2,728) |  |  | $ (2,728) | $ (2,728) |
Non-Controlling Interest | Revision of Prior Period, Error Correction, Adjustment A, G, I, J, K, L, M, O |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss |  | 759 |  |  |  |  |  |
Non-Controlling Interest | Revision of Prior Period, Error Correction, Adjustment P |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive income |  | $ (178) | (69) |  |  |  |  |
Non-Controlling Interest | Revision of Prior Period, Error Correction, Adjustment G, I |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss |  |  | $ (3,240) |  |  |  |  |

X
- Definition Adjustments to Additional Paid in Capital, Net Deferred Tax Liability Resulting from Changes in Outside Basis Difference on Investment + References No definition available. + Details
Name: | sst_AdjustmentsToAdditionalPaidInCapitalNetDeferredTaxLiabilityResultingFromChangesInOutsideBasisDifferenceOnInvestment
Namespace Prefix: | sst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustments To Additional Paid In Capital, Shares, Exercise Of Warrants + References No definition available. + Details
Name: | sst_AdjustmentsToAdditionalPaidInCapitalSharesExerciseOfWarrants
Namespace Prefix: | sst_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Adjustments To Additional Paid In Capital, Value, Exercise Of Warrants + References No definition available. + Details
Name: | sst_AdjustmentsToAdditionalPaidInCapitalValueExerciseOfWarrants
Namespace Prefix: | sst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Issuance Of Common Stock In Connection With Business Combination, Net Of Offering Costs, Underwriting Discounts And Commissions, Shares + References No definition available. + Details
Name: | sst_IssuanceOfCommonStockInConnectionWithBusinessCombinationNetOfOfferingCostsUnderwritingDiscountsAndCommissionsShares
Namespace Prefix: | sst_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Issuance Of Common Stock In Connection With Merger, Net Of Offering Costs, Underwriting Discounts And Commissions, Value + References No definition available. + Details
Name: | sst_IssuanceOfCommonStockInConnectionWithMergerNetOfOfferingCostsUnderwritingDiscountsAndCommissionsValue
Namespace Prefix: | sst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Stock Issued During Period, Share, Conversion of Share Units + References No definition available. + Details
Name: | sst_StockIssuedDuringPeriodShareConversionOfShareUnits
Namespace Prefix: | sst_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Issued During Period, Value, Conversion of Share Units + References No definition available. + Details
Name: | sst_StockIssuedDuringPeriodValueConversionOfShareUnits
Namespace Prefix: | sst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=126964447&loc=d3e11149-113907 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=126964447&loc=d3e11178-113907 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126961718&loc=d3e4534-113899 + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInStockholdersEquityRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=124507222&loc=d3e1436-108581 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669625-108580 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total distributions to each class of partners (i.e., general, limited and preferred partners). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
Name: | us-gaap_PartnersCapitalAccountDistributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 65 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124452729-227067 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3000-108585 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI https://asc.fasb.org/extlink&oid=126929396&loc=SL4569616-111683 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(A)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794 Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 22: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -URI https://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884 Reference 23: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599 Reference 24: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669625-108580 Reference 25: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 26: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iii)(A)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 27: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 28: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(B)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 29: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(ii)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 30: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 31: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI https://asc.fasb.org/extlink&oid=120409616&loc=SL4591551-111686 Reference 32: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI https://asc.fasb.org/extlink&oid=120409616&loc=SL4591552-111686 Reference 33: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794 + Details
Name: | us-gaap_ProfitLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 + Details
Name: | us-gaap_SharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares of stock issued during the period pursuant to acquisitions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesAcquisitions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of stock issued pursuant to acquisitions during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueAcquisitions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 45 -Paragraph 24 -URI https://asc.fasb.org/extlink&oid=124436220&loc=d3e21930-107793 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 45 -Paragraph 23 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124436220&loc=d3e21914-107793 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 10 -Section 65 -Paragraph 4 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 105 -SubTopic 10 -Section 65 -Paragraph 6 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126987489&loc=SL124442142-165695 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 105 -SubTopic 10 -Section 65 -Paragraph 6 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126987489&loc=SL124442142-165695 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI https://asc.fasb.org/extlink&oid=126929396&loc=SL4568740-111683 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 65 -Paragraph 1 -Subparagraph (e)(3) -URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 45 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124436220&loc=d3e21711-107793 Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 65 -Paragraph 8 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=126983759&loc=SL121830611-158277 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 848 -SubTopic 10 -Section 65 -Paragraph 2 -Subparagraph (a)(3)(iii)(03) -URI https://asc.fasb.org/extlink&oid=125980421&loc=SL125981372-237846 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 65 -Paragraph 8 -Subparagraph (d)(3) -URI https://asc.fasb.org/extlink&oid=126983759&loc=SL121830611-158277 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128097895&loc=SL121327923-165333 Reference 22: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI https://asc.fasb.org/extlink&oid=120409616&loc=SL4590271-111686 Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 24: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 25: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=126929396&loc=SL4568447-111683 Reference 26: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (f)(1) -URI https://asc.fasb.org/extlink&oid=128097895&loc=SL121327923-165333 Reference 27: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794 Reference 28: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128097895&loc=SL121327923-165333 + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_RestatementAxis=srt_ScenarioPreviouslyReportedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_PreviouslyReportedBeforeErrorCorrectionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_PreviouslyReportedErrorCorrectionAdjustemntMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=srt_RestatementAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_RevisionOfPriorPeriodAdjustmentBeforeErrorCorrectionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_RevisionOfPriorPeriodAdjustmentIncludingErrorCorrectionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_CumulativeEffectPeriodOfAdoptionAdjustedBalanceBeforeErrorCorrectionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_CumulativeEffectPeriodOfAdoptionAdjustedBalanceIncludingErrorCorrectionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_RevisionOfPriorPeriodErrorCorrectionAdjustmentAGIJKLMOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_RevisionOfPriorPeriodErrorCorrectionAdjustmentGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_RevisionOfPriorPeriodErrorCorrectionAdjustmentMMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_RevisionOfPriorPeriodErrorCorrectionAdjustmentPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_RevisionOfPriorPeriodErrorCorrectionAdjustmentGHMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RestatementAxis=sst_RevisionOfPriorPeriodErrorCorrectionAdjustmentGIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=sst_CommonClassDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |