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Warrants and Warrant Liability (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |
Warrants to purchase | 2,135,092 |  |  |  |
Price per unit (in Dollars per share) |  |  |  | $ 0.01 |
Description of warrants |  | 25% of the units underlying the warrants may be repurchased by NextNav for $1 in total upon meeting all of its obligations and termination of all lender commitments under the terms of the Fortress Financing Agreement prior to the end of the term. Another 25% of the underlying the warrants may be cancelled if NextNav repays 150% of the loan balance under the Fortress Financing |  | 25% of the Units underlying the warrants may be repurchased by NextNav for $1 in total upon meeting all of its obligations and termination of all lender commitments under the terms of the Fortress Financing Agreement prior to the end of the term. Another 25% of the Units underlying the warrants may be cancelled if NextNav repays 150% of the loan balance under the Fortress Financing Agreement. The Redeemable Preferred warrants issued to AT&T were recorded as a liability. |
Fair value of issuance (in Dollars) | $ 200 | $ 38,841 | $ 739 | $ 97,604 |
Warrants to purchase | 468,679 |  |  |  |
Class A Common Stock [Member] |  |  |  |  |
Warrants and Warrant Liability (Details) [Line Items] |  |  |  |  |
Warrants to purchase | 2,603,771 |  |  |  |
Price per unit (in Dollars per share) | $ 0.01 |  |  |  |

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