Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Related Party Transactions (Details)

v3.21.2
Related Party Transactions - Related Party Transactions (Details) - USD ($)
$ in Thousands, shares in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
X-Bow          
Related Party Transaction [Line Items]          
Ownership percentage 17.90%        
Affiliated Entity | Palantir Technologies Inc.          
Related Party Transaction [Line Items]          
Amount Due to Related Party $ 0       $ 0
Total payments 375 $ 0      
Affiliated Entity | Palantir Technologies Inc. | Multi-Year Software Subscription Agreement          
Related Party Transaction [Line Items]          
Amounts of transaction 8,000        
Investor | Seahawk          
Related Party Transaction [Line Items]          
Amount Due to Related Party 19,198       19,198
Amount of debt extinguishment     $ 18,400    
Investor | Intelsat          
Related Party Transaction [Line Items]          
Amount Due to Related Party 52,039       52,039
Debt instrument, face amount     $ 50,000    
Investor | Common Stock warrants | Seahawk          
Related Party Transaction [Line Items]          
Warrants issued (in shares)     13.5    
Investor | Common Stock warrants | Intelsat          
Related Party Transaction [Line Items]          
Warrants issued (in shares)     20.2    
Equity Method Investee | LeoStella          
Related Party Transaction [Line Items]          
Amount Due to Related Party 0       8,012
Total payments 15,060 8,205      
Equity Method Investee | X-Bow          
Related Party Transaction [Line Items]          
Amount Due to Related Party 0       750
Total payments 1,865 $ 3,079      
Former Co-Founders          
Related Party Transaction [Line Items]          
Amount Due to Related Party 10,000       $ 12,500
Total payments $ 2,500        
Former Co-Founders | Legacy BlackSky          
Related Party Transaction [Line Items]          
Debt instrument, face amount       $ 12,500  
Stock repurchased during period (in shares)       11.5