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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Dec. 31, 2023
Summary of Significant Accounting Policies (Details) [Line Items]          
Accounts receivable       $ 2,200 $ 2,300
Contract liabilities $ 303     303 297
Allowances for doubtful accounts 0     0 0
Goodwill impairment $ 0     0 0
Available-for-sale debt securities with fair value option election         $ 0
Fair value, option, changes in fair value, gain (loss) on available-for-sale debt securities in cash and cash equivalents       $ 517  
Stock issued during period for redemption of non-controlling interests   $ (67)      
Warrants outstanding 31,352,520     31,352,520  
Non-controlling interest          
Summary of Significant Accounting Policies (Details) [Line Items]          
Stock issued during period for redemption of non-controlling interests   $ 1,362      
Common Stock          
Summary of Significant Accounting Policies (Details) [Line Items]          
Stock issued during period for warrants exercised, shares 3,176,236 9,738,930 408,231    
Stock issued during period for redemption of non-controlling interests, shares 397,037 397,037      
Stock issued during period for redemption of non-controlling interests $ 1,400        
NextNav France [Member]          
Summary of Significant Accounting Policies (Details) [Line Items]          
Warrants outstanding 0     0  
NextNav France [Member] | Non-controlling interest          
Summary of Significant Accounting Policies (Details) [Line Items]          
Stock issued during period for warrants exercised, shares   399,636