3.26.1 html 9 13 1 true 3 0 false 4 false false R1.htm 000 - Document - Document And Entity Information Sheet http://nextnav.com/role/DocumentAndEntityInformation Document And Entity Information Cover 1 false false R2.htm 995443 - Disclosure - Award Timing Disclosure Sheet http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure Award Timing Disclosure Notes 2 false false R3.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 3 false false All Reports Book All Reports nn-20260408.htm nn-20260408.xsd nn-20260408_cal.xml nn-20260408_def.xml nn-20260408_lab.xml nn-20260408_pre.xml c208b79c2326b04edc11.jpg c2271ab77a08781496ec.jpg c30179f7bf536a5fddc8.jpg c31097210f614c5f290e.jpg c51fdcc4fc244b75c333.jpg c602373fefc0a7d11e56.jpg c99ee5ee17a35f6dc5f3.jpg ca410a693d7f9f957763.jpg cb4e3fe1fdb150fbf764.jpg cd0984bcc521909c2363.jpg cecae02f05d2675ec474.jpg cfd840597385a33bacc7.jpg http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true