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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) |  | 4 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from Operating Activities: |  |  |  |  |  |  |
Net loss |  |  |  | $ (66,043,000) | $ (16,599,000) | $ (137,336,000) | $ (18,302,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |  |
Depreciation and amortization |  |  |  | 671,000 | 25,000 | 235,000 | 88,000
Equity-based compensation |  |  |  | 688,000 | 38,000 | 7,363,000 | 70,000
Change in fair value of warrant liability |  |  |  | 38,841,000 | 739,000 | 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 |  |  |  | 64,000 |  | 259,000 |
Issuance of warrants for rent expense |  |  |  | 5,504,000 |  |  |
Asset retirement obligation accretion |  |  |  | 28,000 | 17,000 |  |
Amortization of debt issuance costs and discount |  |  |  | 461,000 | 331,000 | 748,000 | 1,485,000
Accrued payment in kind (PIK) interest on debt |  |  |  | 2,605,000 | 1,434,000 | 3,554,000 | 1,331,000
Changes in operating assets and liabilities: |  |  |  |  |  |  |
Accrued expenses and other liabilities |  |  |  | (514,000) | (1,204,000) | 128,000 | 1,009,000
Prepaid expenses |  |  |  |  |  | (860,000) | 187,000
Deferred revenue |  |  |  |  |  | (14,000) | 6,000
Other current assets |  |  |  | (5,384,000) | 635,000 |  |
Accounts payable |  |  |  | 1,420,000 | (236,000) | (157,000) | 520,000
Net cash used in operating activities |  |  |  | (21,659,000) | (14,820,000) | (28,405,000) | (15,515,000)
Cash flows from Investing Activities: |  |  |  |  |  |  |
Capitalization of costs and purchases of network assets, property, and equipment |  |  |  | (889,000) | (1,683,000) | (6,419,000) | (59,000)
Purchase of internal use software |  |  |  | (29,000) |  | (759,000) |
Cash used in investing activities |  |  |  | (918,000) | (1,683,000) | (7,178,000) | (59,000)
Cash flows from Financing Activities: |  |  |  |  |  |  |
Proceeds from convertible notes, net |  |  |  |  |  |  | 7,022,000
Proceeds from senior secured loan |  |  |  | 16,647,000 | 31,042,000 | 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
Net cash provided by financing activities |  |  |  | 16,647,000 | 25,664,000 | 34,771,000 | 24,004,000
Effect of exchange rates on cash, cash equivalents and restricted cash |  |  |  |  |  |  | (1,000)
Net increase (decrease) in cash and cash equivalents and restricted cash |  |  |  | (5,930,000) | 9,161,000 | (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 |  |  | $ 13,669,000 | 7,739,000 | 23,642,000 | 13,669,000 | 14,481,000
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 | $ 190,000 | (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: |  |  |  |  |  |  |
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: |  |  |  |  |  |  |
Due to affiliate |  | 293,081 |  |  |  |  |
Accrued expenses and other liabilities | 2,792 |  |  |  |  |  |
Net cash used in operating activities |  |  |  |  |  |  |
Cash flows from Financing Activities: |  |  |  |  |  |  |
Net increase (decrease) 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 |  |  | (3,733,764) | (4,441,634) |  |  |
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) | (44,177) |  |  |
Change in fair value of warrant liability |  |  | 2,975,000 | 1,812,500 |  |  |
Transaction costs allocated to warrant liability |  |  | 604,606 |  |  |  |
Expenses paid by Sponsor |  |  |  | 93 |  |  |
Changes in operating assets and liabilities: |  |  |  |  |  |  |
Prepaid expenses |  |  | (165,091) | (252,768) |  |  |
Accounts payable |  |  | 96,670 | 1,760,364 |  |  |
Net cash used in operating activities |  |  | (251,561) | (1,165,622) |  |  |
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 initial public offering, net of underwriting discounts paid |  |  | 196,000,000 |  |  |  |
Proceeds from Private Placement Warrants |  |  | 8,750,000 |  |  |  |
Proceeds from sale of common stock to initial stockholders |  |  | 25,000 |  |  |  |
Proceeds from issuance of promissory note to related party |  |  | 191,046 | 300,000 |  |  |
Repayment of Promissory Note to Sponsor |  |  | (191,046) |  |  |  |
Payment of offering costs |  |  | (516,309) |  |  |  |
Net cash provided by financing activities |  |  | 204,258,691 | 300,000 |  |  |
Net increase (decrease) in cash and cash equivalents and restricted cash |  |  | 1,007,130 | (865,622) |  |  |
Cash, cash equivalents and restricted cash at beginning of period |  |  |  | 1,007,130 |  |  |
Cash, cash equivalents and restricted cash at end of period |  |  | 1,007,130 | 141,508 |  | $ 1,007,130 |
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 | (4,511,634) |  |  |
Supplemental disclosure of cash flow information: |  |  |  |  |  |  |
Cash taxes paid |  |  |  | 31,475 |  |  |
Transfer of cash from trust for payment of Delaware state franchise tax |  |  |  | $ 68,864 |  |  |

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