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