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Debt (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 31, 2020
Debt (Details) [Line Items]            
Borrowings       $ 100,000,000    
Agreement total commitment $ 105,300,000         $ 65,000,000
Interest expense 5,400,000 $ 4,300,000        
Amortized debt issuance costs 500,000 $ 300,000        
Fair value Level 3 hierarchy 75,300,000   $ 59,100,000      
Convertible notes payable       $ 35,000,000 $ 35,000,000  
Share price (in Dollars per share)       $ 3 $ 3  
Convert discount     25.00%      
Liabilities issuance       $ 700,000 $ 1,600,000  
Notes payable       18,800,000    
Derivative issuance amount       2,300,000    
Extinguishment resulting gain       400,000    
Gain loss on extinguishment       1,900,000    
Description of convertible loan commitments     The remaining $3.8 million of 2019 Notes were mandatorily convertible into loan commitments under the Fortress Financing Agreement in amounts equal to the outstanding principal and accrued interest.      
Debt issuance cost     $ 200,000      
Debt discount       1,100,000    
Commitment fee       2,400,000    
Interest rate percentage     6.00%      
Reference rate     7.00%      
Margin rate     12.00%      
Fair value of loan     $ 59,100,000 23,700,000    
Purchase of warrants per unit (in Dollars per share)     $ 0.01      
Fair value of warrants issued     $ 200,000 3,500,000    
PIK interest [Member]            
Debt (Details) [Line Items]            
Debt discount       6,800,000    
LIBOR loans [Member]            
Debt (Details) [Line Items]            
Interest rate percentage     5.00%      
Reference rate     6.00%      
Fortress Financing Agreement [Member]            
Debt (Details) [Line Items]            
Borrowings       100,000,000    
PIK interest [Member]            
Debt (Details) [Line Items]            
Commitment fee       1,400,000    
NextNav [Member]            
Debt (Details) [Line Items]            
Borrowings     $ 63,900,000 23,700,000    
Commitment fee     $ 600,000 3,800,000    
Minimum [Member]            
Debt (Details) [Line Items]            
Agreement total commitment           100,000,000
Increased in operations amount 65,000,000          
Maximum [Member]            
Debt (Details) [Line Items]            
Agreement total commitment           $ 105,300,000
Increased in operations amount $ 80,000,000          
2018 Notes [Member]            
Debt (Details) [Line Items]            
Unsecured convertible bridge amount         $ 14,000,000  
Interes rate         8.00%  
Convert discount     15.00%      
2019 Notes [Member]            
Debt (Details) [Line Items]            
Unsecured convertible bridge amount       $ 7,000,000    
Interes rate       8.00%    
Convert discount     25.00%      
Accrued interest       $ 3,900,000    
Series D Preferred Stock [Member]            
Debt (Details) [Line Items]            
Issued of fair value       785,000    
Series D Preferred Stock [Member] | 2018 Notes [Member]            
Debt (Details) [Line Items]            
Accrued interest       $ 8,120,409    
Common Class A [Member]            
Debt (Details) [Line Items]            
Purchase of warrants (in Shares)     2,135,092 31,649,484    
Purchase of warrants per unit (in Dollars per share)           $ 0.01