Warrants and Warrant Liability (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Warrants and Warrant Liability (Details) [Line Items]
Financing warrants outstanding	33,784,576
Additional paid-in capital (in Dollars) | $	$ 174.3
Fair value adjustment (in Dollars) | $	$ 84.0
Warrants outstanding	4,320,133
Price per unit (in Dollars per share) | $ / shares	$ 0.01
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
Warrant [Member]
Warrants and Warrant Liability (Details) [Line Items]
Warrants outstanding	18,875,000
Public warrants sold	10,000,000
Warrants issued	8,750,000
Warrant liability description	The Private Placement Warrants are classified as a liability on the Company’s Consolidated Balance Sheet as of December 31, 2021. As of December 31, 2021, the Company recorded $12.9 million to the Consolidated Statement of Comprehensive Loss as a fair value adjustment for the Private Placement Warrants. Upon consummation of the Business Combination, the terms included in the Public Warrants that initially precluded equity classification were no longer applicable, with the Public Warrants issued during Sparatcus’ initial public offering being reclassified from a liability to equity. Accordingly, NextNav reclassified $17.8 million from warrant liability to additional paid-in capital.
Warrants to purchase	1
Price per unit (in Dollars per share) | $ / shares	$ 11.5