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Condensed Consolidated Statements of Cash Flows - USD ($) |  | 2 Months Ended | 4 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from Operating Activities: |  |  |  |  |  |  |  |
Net loss |  |  |  |  | $ (98,465,000) | $ (23,414,000) | $ (137,336,000) | $ (18,302,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |  |  |
Accrued expenses and other liabilities |  |  |  |  | 1,424,000 | 18,000 | 128,000 | 1,009,000
Depreciation and amortization |  |  |  |  | 1,069,000 | 48,000 | 235,000 | 88,000
Equity-based compensation |  |  |  |  | 1,033,000 | 53,000 | 7,363,000 | 70,000
Change in fair value of warrant liability |  |  |  |  | 61,184,000 | (554,000) | 97,604,000 |
Change in fair value of derivative |  |  |  |  |  |  |  | (1,918,000)
Gain on extinguishment of debt |  |  |  |  |  |  |  | (18,000)
Asset retirement obligation accretion |  |  |  |  |  |  | 71,000 | 27,000
Fixed asset write-off |  |  |  |  | 66,000 |  | 259,000 |
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  | (14,000) | 6,000
Issuance of warrants for rent expense |  |  |  |  | 5,504,000 |  |  |
Asset retirement obligation accretion |  |  |  |  | 56,000 | 53,000 |  |
Amortization of debt issuance costs and discount |  |  |  |  | 671,000 | 473,000 | 748,000 | 1,485,000
Accrued payment in kind (PIK) interest on debt |  |  |  |  | 4,231,000 | 2,438,000 | 3,554,000 | 1,331,000
Other current assets |  |  |  |  | (4,074,000) | 1,937,000 |  |
Other assets |  |  |  |  | (3,276,000) | (40,000) |  |
Prepaid expenses |  |  |  |  |  |  | (860,000) | 187,000
Accounts payable |  |  |  |  | 1,148,000 | 153,000 | (157,000) | 520,000
Net cash used in operating activities |  |  |  |  | (29,429,000) | (18,835,000) | (28,405,000) | (15,515,000)
Cash flows from Investing Activities: |  |  |  |  |  |  |  |
Capitalization of costs and purchases of network assets, property, and equipment |  |  |  |  | (857,000) | (5,701,000) | (6,419,000) | (59,000)
Purchase of internal use software |  |  |  |  | (197,000) | (21,000) | (759,000) |
Cash used in investing activities |  |  |  |  | (1,054,000) | (5,722,000) | (7,178,000) | (59,000)
Cash flows from Financing Activities: |  |  |  |  |  |  |  |
Proceeds from convertible notes, net |  |  |  |  |  |  |  | 7,022,000
Proceeds from senior secured loan |  |  |  |  | 18,467,000 | 35,215,000 | 40,307,000 | 23,635,000
Senior secured loan issuance costs |  |  |  |  |  | (5,378,000) | (5,539,000) | (2,857,000)
Convertible note repayment |  |  |  |  |  |  |  | (3,800,000)
Proceeds from exercise of Class A unit options |  |  |  |  |  |  | 3,000 | 4,000
Proceeds from issuance of Class A Common Units |  |  |  |  | 2,000 |  |  |
Net cash provided by financing activities |  |  |  |  | 18,469,000 | 29,837,000 | 34,771,000 | 24,004,000
Effect of exchange rates on cash and cash equivalents and restricted cash |  |  |  |  | (14,000) | (1,000) |  | (1,000)
Net (decrease) increase in cash and cash equivalents and restricted cash |  |  |  |  | (12,028,000) | 5,279,000 | (812,000) | 8,429,000
Cash, cash equivalents and restricted cash at beginning of period |  |  |  |  | 13,669,000 | 14,481,000 | 14,481,000 | 6,052,000
Cash, cash equivalents and restricted cash at end of period |  | $ 19,760,000 | $ 1,641,000 | $ 13,669,000 | 1,641,000 | 19,760,000 | 13,669,000 | 14,481,000
Supplemental cash flow information |  |  |  |  |  |  |  |
Capital expenditures included in Accounts payable |  |  |  |  | 112,000 | 128,000 |  |
Settlement of notes payable for Class D preferred shares |  |  |  |  |  |  |  | (18,544,000)
Financing costs accrued but not paid |  |  |  |  |  |  |  | (5,378,000)
Issuance of Warrants |  |  |  |  | 5,504,000 |  | (222,000) | $ (3,531,000)
Spartacus Acquisition Shelf Corp. [Member] |  |  |  |  |  |  |  |
Cash flows from Operating Activities: |  |  |  |  |  |  |  |
Net loss | $ (2,792) |  | (293,081) |  |  |  |  |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |  |  |
Due to affiliate |  |  | 293,081 |  |  |  |  |
Accrued expenses and other liabilities | 2,792 |  |  |  |  |  |  |
Accretion of interest on cash and marketable securities held in Trust Account |  |  |  |  |  |  |  |
Change in fair value of warrant liability |  |  |  |  |  |  |  |
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |
Net cash used in operating activities |  |  |  |  |  |  |  |
Cash flows from Financing Activities: |  |  |  |  |  |  |  |
Net (decrease) increase in cash and cash equivalents and restricted cash |  |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash at beginning of period |  |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash at end of period |  |  |  |  |  |  |  |
Spartacus Acquisition Corp [Member] |  |  |  |  |  |  |  |
Cash flows from Operating Activities: |  |  |  |  |  |  |  |
Net loss |  | (1,873) |  | (3,733,764) | (12,387,895) |  |  |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |  |  |
Accretion of interest on cash and marketable securities held in Trust Account |  |  |  | (28,982) | (47,296) |  |  |
Change in fair value of warrant liability |  |  |  | 2,975,000 | 8,900,000 |  |  |
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |
Transaction costs allocated to warrant liability |  |  |  | 604,606 |  |  |  |
Due from Sponsor and related parties |  |  |  |  | (6,090) |  |  |
Prepaid expenses |  |  |  | (165,091) | (104,717) |  |  |
Due to related party |  | 75 |  |  | 65 |  |  |
Accounts payable |  |  |  | 96,670 | 2,074,944 |  |  |
Net cash used in operating activities |  | (1,798) |  | (251,561) | (1,570,989) |  |  |
Cash flows from Investing Activities: |  |  |  |  |  |  |  |
Purchase of marketable securities |  |  |  |  | (406,042,000) |  |  |
Maturity of marketable securities |  |  |  |  | 406,042,000 |  |  |
Purchase of investment held in Trust Account |  |  |  | (202,995,370) |  |  |  |
Principal deposited in Trust Account |  |  |  | (4,630) |  |  |  |
Cash used in investing activities |  |  |  | (203,000,000) |  |  |  |
Cash flows from Financing Activities: |  |  |  |  |  |  |  |
Proceeds from issuance of promissory note to related party |  | 188,500 |  | 191,046 | 600,000 |  |  |
Repayment of Promissory Note to Sponsor |  |  |  | (191,046) |  |  |  |
Payment of offering costs |  |  |  | (516,309) |  |  |  |
Proceeds from initial public offering, net of underwriting discounts paid |  |  |  | 196,000,000 |  |  |  |
Proceeds from Private Placement Warrants |  |  |  | 8,750,000 |  |  |  |
Proceeds from issuance of founder shares |  | 25,000 |  | 25,000 |  |  |  |
Payment of deferred offering costs |  | (183,443) |  |  |  |  |  |
Net cash provided by financing activities |  | 30,057 |  | 204,258,691 | 600,000 |  |  |
Net (decrease) increase in cash and cash equivalents and restricted cash |  | 28,259 |  | 1,007,130 | (970,989) |  |  |
Cash, cash equivalents and restricted cash at beginning of period |  |  |  |  | 1,007,130 |  |  |
Cash, cash equivalents and restricted cash at end of period |  | 28,259 | $ 36,141 | 1,007,130 | 36,141 | $ 28,259 | $ 1,007,130 |
Supplemental cash flow information |  |  |  |  |  |  |  |
Increase in accounts payable and accrued expenses for deferred offering costs |  |  |  |  | 70,000 |  |  |
Accrued deferred underwriting fee |  |  |  | 7,000,000 |  |  |  |
Initial classification of warrant liability |  |  |  | 20,037,500 |  |  |  |
Initial value of Class A common stock subject to possible redemption |  |  |  | 172,248,666 |  |  |  |
Change in value of Class A common stock subject to possible redemption |  |  |  | $ 3,156,634 | 21,569 |  |  |
Supplemental disclosure of cash flow information: |  |  |  |  |  |  |  |
Cash taxes paid |  |  |  |  | 47,213 |  |  |
Transfer of cash from trust for payment of Delaware state franchise tax |  |  |  |  | $ 68,864 |  |  |

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