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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment | Accumulated deficit | Accumulated deficit Cumulative Effect, Period of Adoption, Adjustment
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  |  | 52,028 | 5,060 |  |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 463,587 | $ (10,081) | $ 5 | $ (105,584) | $ 597,553 | $ (23,373) | $ 49 | $ (5,014) | $ (10,130)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Stock based compensation | 27,201 |  |  |  | 27,201 |  |  |  |
Issuance of restricted stock (in shares) |  |  | 1,707 |  |  |  |  |  |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |
Preferred stock dividends | (24,331) |  |  |  | (24,331) |  |  |  |
Amortization of preferred stock issuance costs | $ (1,262) |  |  |  | (1,262) |  |  |  |
Retirement of treasury stock (in shares) | 3,900 |  | (3,893) | 3,893 |  |  |  |  |
Retirement of treasury stock | $ 0 |  |  | $ 68,327 | (68,327) |  |  |  |
Shares withheld for taxes in connection with issuance of restricted stock (in shares) |  |  | (6) |  |  |  |  |  |
Shares withheld for taxes in connection with issuance of restricted stock | (76) |  |  |  | (76) |  |  |  |
Treasury shares received in connection with PIPE Purchase Agreement (in shares) |  |  |  | (5,995) |  |  |  |  |
Treasury shares received in connection with PIPE Purchase Agreement | (44,830) |  |  | $ (44,830) |  |  |  |  |
Net loss attributable to Synchronoss | (218,155) |  |  |  |  |  |  | (218,155) |
Non-controlling interest | 3,943 |  |  |  | 3,943 |  |  |  |
Total other comprehensive income (loss) | (7,059) |  |  |  |  | (7,059) |  |  |
Other | (28) |  |  |  | (28) |  |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  |  | 49,836 | 7,162 |  |  |  |  |
Ending balance at Dec. 31, 2018 | $ 188,909 | 3,574 | $ 5 | $ (82,087) | 534,673 | (30,383) |  | (233,299) | 3,574
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201609Member |  |  |  |  |  |  |  |
Stock based compensation | $ 22,050 |  |  |  | 22,050 |  |  |  |
Issuance of restricted stock (in shares) |  |  | 1,863 |  |  |  |  |  |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |
Preferred stock dividends | (29,877) |  |  |  | (29,877) |  |  |  |
Amortization of preferred stock issuance costs | (2,257) |  |  |  | (2,257) |  |  |  |
Shares withheld for taxes in connection with issuance of restricted stock (in shares) |  |  | (2) |  |  |  |  |  |
Shares withheld for taxes in connection with issuance of restricted stock | (15) |  |  |  | (15) |  |  |  |
Issuance of common stock on exercise of options (in shares) |  |  | 7 |  |  |  |  |  |
Issuance of common stock on exercise of options | 39 |  |  |  | 39 |  |  |  |
Net loss attributable to Synchronoss | (104,593) |  |  |  |  |  |  | (104,593) |
Non-controlling interest | 1,126 |  |  |  | 1,126 |  |  |  |
Total other comprehensive income (loss) | (2,878) |  |  |  |  | (2,878) |  |  |
Other | $ (1) |  |  |  |  |  |  | (1) |
Ending balance (in shares) at Dec. 31, 2019 | 51,704 |  | 51,704 | 7,162 |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 76,077 | $ (750) | $ 5 | $ (82,087) | 525,739 | (33,261) |  | (334,319) | $ (750)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |
Stock based compensation | $ 11,246 |  |  |  | 11,246 |  |  |  |
Issuance of restricted stock (in shares) |  |  | (525) |  |  |  |  |  |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |
Preferred stock dividends | (34,451) |  |  |  | (34,451) |  |  |  |
Amortization of preferred stock issuance costs | (3,530) |  |  |  | (3,530) |  |  |  |
Shares withheld for taxes in connection with issuance of restricted stock (in shares) |  |  | (2) |  |  |  |  |  |
Shares withheld for taxes in connection with issuance of restricted stock | $ 0 |  |  |  |  |  |  |  |
Issuance of common stock on exercise of options (in shares) | 0 |  |  |  |  |  |  |  |
Net loss attributable to Synchronoss | $ (10,358) |  |  |  |  |  |  | (10,358) |
Non-controlling interest | 0 |  |  |  | 344 |  |  | (344) |
Total other comprehensive income (loss) | $ 5,048 |  |  |  |  | 5,048 |  |  |
Ending balance (in shares) at Dec. 31, 2020 | 51,177 |  | 51,177 | 7,162 |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 43,282 |  | $ 5 | $ (82,087) | $ 499,348 | $ (28,213) |  | $ (345,771) |

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