Summary of Significant Accounting Policies (Details) - Schedule of depreciation using the straight-line method over the estimated useful lives of the assets	9 Months Ended
	Sep. 30, 2025
Acquired finite-lived intangible assets [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	12 years
Leasehold Improvements [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives, description	Shorter of the useful life or lease term
Minimum [Member] \| Pinnacle and TerraPoiNT network assets [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	5 years
Minimum [Member] \| Office equipment, furniture and internal use software [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	2 years
Maximum [Member] \| Pinnacle and TerraPoiNT network assets [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	8 years
Maximum [Member] \| Office equipment, furniture and internal use software [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	5 years

NEXTNAV INC. 10-Q