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Warrants and Warrant Liability (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 08, 2023 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Jul. 06, 2023 | May 09, 2023
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding |  | 31,352,520 |  |  | 31,352,520 |  |  |
Description of warrants |  |  |  |  | the right to redeem the outstanding Public Warrants in whole and not in part at a price of $0.01 per warrant upon a minimum of 30 days’ prior written notice of redemption, if and only if the last sales price of the Company’s common stock matched or exceeded $18.00 per share for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which NextNav sends the notice of redemption to the warrant holders. |  |  |
Reclassification from warrant liability to additional paid-in capital |  | $ 4,747 | $ 4,308 | $ 2,468 |  |  |  |
Aggregate proceeds from warrant Exercises |  |  |  |  | $ 27,896 | $ 882 |  |
Warrant [Member] |  |  |  |  |  |  |  |
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |  |  |  |
Reclassification from warrant liability to equity (in shares) |  | 1,259,322 |  |  | 3,510,338 |  |  |
Reclassification from warrant liability to additional paid-in capital |  | $ 4,800 |  |  | $ 11,500 |  |  |
Note Purchase Agreement and Indenture Agreement [Member] | Senior Secured Notes due 2026 [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |  |  |  |
Exercise period of debt issued, from date of initial closing | 30 days |  |  |  |  |  |  |
Note Purchase Agreement and Indenture Agreement [Member] | Senior Secured Notes due 2026 [Member] | Warrant [Member] |  |  |  |  |  |  |  |
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding |  | 12,602,530 |  |  | 12,602,530 |  | 7,407,407 | 18,518,520
Class of warrant or right number of securities called by each warrant or right |  | 1 |  |  | 1 |  |  |
Exercise price per unit (in Dollars per share) |  | $ 2.16 |  |  | $ 2.16 |  | $ 2.16 | $ 2.16
Warrants, maturity date |  | Jun. 01, 2027 |  |  | Jun. 01, 2027 |  |  |
Financial Instrument Subject to Mandatory Redemption, Par Value Per Share |  | $ 0.01 |  |  | $ 0.01 |  |  |
Fair value of debt |  | $ 22,800 |  |  | $ 22,800 |  | $ 8,200 | $ 14,600
Stock issued during period for warrants exercised, shares |  | 3,176,236 |  |  | 12,915,166 |  |  |
Aggregate proceeds from warrant Exercises |  | $ 6,900 |  |  | $ 27,900 |  |  |
Note Purchase Agreement and Indenture Agreement [Member] | Senior Secured Notes due 2026 [Member] | Warrant [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |  |  |  |
Debt instrument, Redemption price, Percentage of exercise price of warrants |  | 130.00% |  |  | 130.00% |  |  |
Note Purchase Agreement and Indenture Agreement [Member] | Senior Secured Notes due 2026 [Member] | Warrant [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |  |  |  |
Exercise period of debt issued, from date of initial closing |  |  |  |  | 35 days |  |  |
Public Warrants and Private Placement Warrants [Member] |  |  |  |  |  |  |  |
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |  |  |  |
Exercise price per unit (in Dollars per share) |  | $ 11.5 |  |  | $ 11.5 |  |  |
Warrants, maturity date |  | Oct. 28, 2026 |  |  | Oct. 28, 2026 |  |  |
Public Warrants and Private Placement Warrants [Member] | Note Purchase Agreement and Indenture Agreement [Member] | Senior Secured Notes due 2026 [Member] | Warrant [Member] |  |  |  |  |  |  |  |
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |  |  |  |
Class of warrant or right number of securities called by each warrant or right |  | 1 |  |  | 1 |  |  |
Public Warrants [Member] |  |  |  |  |  |  |  |
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding |  | 14,509,798 |  |  | 14,509,798 |  |  |
Private Placement Warrants [Member] |  |  |  |  |  |  |  |
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding |  | 4,240,192 |  |  | 4,240,192 |  |  |

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