Equity-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Equity-Based Compensation (Details) [Line Items]
Total compensation cost related to nonvested awards not yet recognized		$ 3,280
Equity-based compensation expense		$ 21,838	$ 26,501
Weighted average remaining vesting contractual term		8 years 11 months 26 days
Number of share-based options, outstanding		3,641,000	2,293,000
Weighted average remaining contractual term			8 years 14 days
Intrinsic value of options exercised
Weighted-average period over which is expected to recognized		2 years 7 months 6 days
Expected dividend rate		0.00%	0.00%
Common Stock [Member]
Equity-Based Compensation (Details) [Line Items]
Expected dividend rate		0.00%
NextNav 2021 Omnibus Incentive Plan (the “Omnibus Plan”) [Member]
Equity-Based Compensation (Details) [Line Items]
Number of shares available for issuance		5,636,259
Service-based awards vesting period		4 years
Number of share-based options, outstanding		8,231,360
Number of shares approved and issued as stock options and restricted stock awards	12,818,902
Restricted Stock Units [Member]
Equity-Based Compensation (Details) [Line Items]
Equity-based compensation expense		$ 19,300
Weighted-average period over which is expected to recognized		2 years 11 months 23 days
Units granted in 2023		5,448,000
Weighted average grant date fair value		$ 19,200
Weighted averag fair value		17,900
Total compensation cost related to RSAs and RSUs not yet recognized		$ 17,900
Restricted Stock Units [Member] | Ms. Mariam Sorond (President and CEO) [Member]
Equity-Based Compensation (Details) [Line Items]
Units granted in 2023		1,000,000
Performance period		4 years
Employee Stock Option
Equity-Based Compensation (Details) [Line Items]
Equity-based compensation expense		$ 2,570	$ 1,400
Weighted average grant date fair value of options granted		$ 2.52	$ 6.98
Intrinsic value of options exercised		$ 1,090	$ 290
Expected dividend rate