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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Oct. 28, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Subsequent Events (Details) [Line Items] |  |  |  |  |  |
Cash balance increased |  |  | $ 1,641 | $ 8,669 | $ 14,481 |
Share price (in Dollars per share) |  |  |  |  | $ 3 | $ 3
Subsequent Event [Member] |  |  |  |  |  |
Subsequent Events (Details) [Line Items] |  |  |  |  |  |
Transactions shares issued (in Shares) | 67,419,627 |  |  |  |  |
Purchase shares (in Shares) | 4,320,133 |  |  |  |  |
Option shares purchased (in Shares) | 1,968,861 |  |  |  |  |
Subsequent event, description | Upon consummation of the Business Combination, AT&T elected to exchange its Vendor Warrants in the Company for a new warrant to purchase 4,320,133 shares of common stock in NextNav Inc. at an exercise price of $0.01 (the “Public Warrant”) and the outstanding Financing Warrants were exercised by the holders and immediately converted to common stock in NextNav Inc. |  |  |  |  |
Financing agreement outstanding balance | $ 96,800 |  |  |  |  |
Committed amount |  | $ 105,300 |  |  |  |
Minimum [Member] | Subsequent Event [Member] |  |  |  |  |  |
Subsequent Events (Details) [Line Items] |  |  |  |  |  |
Fund operations |  | 65,000 |  |  |  |
Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |
Subsequent Events (Details) [Line Items] |  |  |  |  |  |
Fund operations |  | $ 80,000 |  |  |  |
PIPE [Member] |  |  |  |  |  |
Subsequent Events (Details) [Line Items] |  |  |  |  |  |
Cash balance increased | $ 104,200 |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |
Subsequent Events (Details) [Line Items] |  |  |  |  |  |
Shares issue (in Shares) | 20,500,000 |  |  |  |  |
Share price (in Dollars per share) | $ 10 |  |  |  |  |

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