Warrants and Warrant Liability (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jun. 08, 2023	Dec. 31, 2023	Dec. 31, 2022	Jul. 06, 2023	May 09, 2023
Warrants and Warrant Liability (Details) [Line Items]
Warrants outstanding		44,267,686
Warrants issued		7,750,530
Warrants expire years		5 years
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.
Change in fair value of warranty liability		$ 4,101	$ (24,675)
Private Warrants [Member]
Warrants and Warrant Liability (Details) [Line Items]
Reclassification from warrant liability to equity (in shares)		999,470
Public Warrants and Private Placement Warrants [Member]
Warrants and Warrant Liability (Details) [Line Items]
Price per unit (in Dollars per share)		$ 11.5
Spartacus Acquisition Corp.'s ("Spartacus") [Member] | Public Warrants [Member] | Initial Public Offering [Member]
Warrants and Warrant Liability (Details) [Line Items]
Number of shares issued		10,999,460
Senior Secured Notes due 2026 [Member] | Note Purchase Agreement and Indenture Agreement [Member] | Maximum [Member]
Warrants and Warrant Liability (Details) [Line Items]
Exercise period of debt issued, from date of initial closing	30 days
Warrant [Member]
Warrants and Warrant Liability (Details) [Line Items]
Warrants issued		25,517,696
Warrants to purchase		1
Reclassification from warrant liability to additional paid-in capital		$ 1,200
Change in fair value of warranty liability		$ 4,100
Warrant [Member] | Senior Secured Notes due 2026 [Member] | Note Purchase Agreement and Indenture Agreement [Member]
Warrants and Warrant Liability (Details) [Line Items]
Warrants outstanding				7,407,407	18,518,520
Price per unit (in Dollars per share)				$ 2.16	$ 2.16
Financial Instrument Subject to Mandatory Redemption, Par Value Per Share		$ 0.01
Debt instrument, Redemption price, Percentage of exercise price of warrants		130.00%
Fair value of loan		$ 22,800		$ 8,200	$ 14,600
Warrant [Member] | Senior Secured Notes due 2026 [Member] | Note Purchase Agreement and Indenture Agreement [Member] | Minimum [Member]
Warrants and Warrant Liability (Details) [Line Items]
Debt instrument, Redemption price, Percentage of exercise price of warrants		130.00%
Warrant [Member] | Senior Secured Notes due 2026 [Member] | Note Purchase Agreement and Indenture Agreement [Member] | Maximum [Member]
Warrants and Warrant Liability (Details) [Line Items]
Exercise period of debt issued, from date of initial closing		35 days