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Debt (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2021 | Jan. 31, 2020 | Jan. 30, 2020
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  |  | $ 100,000,000 |  |  |  |
Agreement total commitment |  |  |  |  |  | $ 105,300,000 | $ 65,000,000 |
Interest expense | $ 8,200,000 | $ 6,700,000 |  |  |  |  |  |
Amortized debt issuance costs | 700,000 | $ 500,000 |  |  |  |  |  |
Fair value Level 3 hierarchy | $ 80,700,000 |  | $ 59,100,000 |  |  |  |  |
Convertible notes payable |  |  |  | $ 35,000,000 | $ 35,000,000 |  |  |
Share price (in Dollars per share) |  |  |  | $ 3 | $ 3 |  |  |
Convert discount |  |  | 25.00% |  |  |  |  |
Liabilities issuance |  |  |  | $ 700,000 | $ 1,600,000 |  |  |
Notes payable |  |  |  | 18,800,000 |  |  |  |
Derivative issuance amount |  |  |  | 2,300,000 |  |  |  |
Extinguishment resulting gain |  |  |  | 400,000 |  |  |  |
Gain loss on extinguishment |  |  |  | 1,900,000 |  |  |  |
Description of convertible loan commitments |  |  | The remaining $3.8 million of 2019 Notes were mandatorily convertible into loan commitments under the Fortress Financing Agreement in amounts equal to the outstanding principal and accrued interest. |  |  |  |  |
Debt issuance cost |  |  | $ 200,000 |  |  |  |  |
Debt discount |  |  |  | 1,100,000 |  |  |  |
Commitment fee |  |  |  | 2,400,000 |  |  |  |
Interest rate percentage |  |  | 6.00% |  |  |  |  |
Reference rate |  |  | 7.00% |  |  |  |  |
Margin rate |  |  | 12.00% |  |  |  |  |
Fair value of loan |  |  | $ 59,100,000 | 23,700,000 |  |  |  |
Purchase of warrants per unit (in Dollars per share) |  |  | $ 0.01 |  |  |  |  |
Fair value of warrants issued |  |  | $ 200,000 | 3,500,000 |  |  |  |
PIK interest [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Debt discount |  |  |  | 6,800,000 |  |  |  |
LIBOR loans [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Interest rate percentage |  |  | 5.00% |  |  |  |  |
Reference rate |  |  | 6.00% |  |  |  |  |
Fortress Financing Agreement [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  |  | 100,000,000 |  |  |  |
PIK interest [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Commitment fee |  |  |  | 1,400,000 |  |  |  |
NextNav [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  | $ 63,900,000 | 23,700,000 |  |  |  |
Commitment fee |  |  | $ 600,000 | 3,800,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Agreement total commitment |  |  |  |  |  |  | 100,000,000 |
Increased in operations amount |  |  |  |  |  | 65,000,000 |  |
Maximum [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Agreement total commitment |  |  |  |  |  |  | $ 105,300,000 |
Increased in operations amount |  |  |  |  |  | $ 80,000,000 |  |
2018 Notes [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Unsecured convertible bridge amount |  |  |  |  | $ 14,000,000 |  |  |
Interes rate |  |  |  |  | 8.00% |  |  |
Convert discount |  |  | 15.00% |  |  |  |  |
2019 Notes [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Unsecured convertible bridge amount |  |  |  | $ 7,000,000 |  |  |  |
Interes rate |  |  |  | 8.00% |  |  |  |
Convert discount |  |  | 25.00% |  |  |  |  |
Accrued interest |  |  |  | $ 3,900,000 |  |  |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Issued of fair value |  |  |  | 785,000 |  |  |  |
Series D Preferred Stock [Member] | 2018 Notes [Member] |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Accrued interest |  |  |  | $ 8,120,409 |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |
Debt (Details) [Line Items] |  |  |  |  |  |  |  |
Purchase of warrants (in Shares) |  |  | 2,135,092 | 31,649,484 |  |  |  |
Purchase of warrants per unit (in Dollars per share) |  |  |  |  |  |  |  | $ 0.01

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