Warrants and Warrant Liability (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Warrants and Warrant Liability (Details) [Line Items]
Warrants outstanding	37,137,806
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.
Warrant [Member]
Warrants and Warrant Liability (Details) [Line Items]
Stock Reclassified During Period Shares Reclassification From Warrant Liability To Equity	0	205,402
Adjustments To Additional Paid In Capital Reclassification From Warrant Liability	$ 0.0	$ 1.2
Note Purchase Agreement and Indenture Agreement [Member] | Senior Secured Notes due 2026 [Member] | Warrant [Member]
Warrants and Warrant Liability (Details) [Line Items]
Warrants outstanding	10,588,847
Public Warrants and Private Placement Warrants [Member]
Warrants and Warrant Liability (Details) [Line Items]
Warrants, maturity date	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
Exercise price per unit (in Dollars per share)	$ 11.5
Public Warrants [Member]
Warrants and Warrant Liability (Details) [Line Items]
Warrants outstanding	14,714,169
Private Placement Warrants [Member]
Warrants and Warrant Liability (Details) [Line Items]
Warrants outstanding	4,034,790
Common stock purchase warrants [Member] | Note Purchase Agreement [Member] | Private Placement [Member]
Warrants and Warrant Liability (Details) [Line Items]
Warrants outstanding	7,800,000