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Debt and Other Financing - Additional Information (Detail)

v3.21.2
Debt and Other Financing - Additional Information (Detail)
shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 09, 2021
USD ($)
Apr. 28, 2021
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Feb. 03, 2021
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TRANCHE
Dec. 31, 2020
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Oct. 31, 2019
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Nov. 13, 2018
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Jun. 27, 2018
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Oct. 19, 2017
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Jun. 30, 2021
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Feb. 28, 2021
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Apr. 30, 2020
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Oct. 31, 2019
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Sep. 30, 2021
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Sep. 30, 2020
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Sep. 30, 2021
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TRANCHE
Sep. 30, 2020
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Dec. 31, 2020
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Dec. 31, 2019
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Feb. 18, 2021
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Feb. 02, 2021
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Jan. 01, 2020
Debt Instrument [Line Items]                                          
Long-term Debt, Gross       $ 103,435,000                 $ 81,237,000   $ 81,237,000   $ 103,435,000 $ 123,044,000      
Proceeds from Issuance of Long-term Debt                                 3,600,000 107,640,000      
Long-term Debt, Fair Value       79,700,000                 78,500,000   $ 78,500,000   79,700,000        
Number of tranches     2             2         3            
Proceeds from convertible debt     $ 58,600,000                                    
Debt payments $ 21,400,000                           $ 22,198,000 $ 0          
Repayments of line of credit 16,100,000                                        
Repayments of SBA paycheck protection program loan 3,500,000                                        
Repayments of other debt 1,800,000                                        
Gain on debt extinguishment $ 12,000                           (75,000) 284,000 284,000 (3,267,000)      
line of credit       16,100,000                         16,100,000        
Fair Value, Inputs, Level 2 [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Fair Value       79,700,000                         79,700,000 63,900,000      
Stock Purchase Agreement [Member]                                          
Debt Instrument [Line Items]                                          
Percentage Of Equity Interest Subject For Sale                                         100.00%
Seahawk SPV Investment L L C [Member] | Warrants To Purchase Common Stock [Member]                                          
Debt Instrument [Line Items]                                          
Class Of Warrant Or Right Number Of Securities Issued During Period | shares         13.5                                
Intelsat Jackson Holdings S A [Member] | Debt Instrument Interest Rate Period One [Member]                                          
Debt Instrument [Line Items]                                          
Interest rate         4.00%             4.00%                  
Intelsat Jackson Holdings S A [Member] | Debt Instrument Interest Rate Period Two [Member]                                          
Debt Instrument [Line Items]                                          
Interest rate         9.00%             9.00%                  
Intelsat Jackson Holdings S A [Member] | Debt Instrument Interest Rate Period Three [Member]                                          
Debt Instrument [Line Items]                                          
Interest rate         10.00%             10.00%                  
Intelsat Jackson Holdings S A [Member] | Debt Instrument Interest Rate Period Four [Member]                                          
Debt Instrument [Line Items]                                          
Interest rate         4.00%             4.00%                  
Intelsat Jackson Holdings S A [Member] | Warrants To Purchase Common Stock [Member]                                          
Debt Instrument [Line Items]                                          
Class Of Warrant Or Right Number Of Securities Issued During Period | shares         20.2                                
Jason And Marian Joh Andrews. [Member] | Common Stock [Member]                                          
Debt Instrument [Line Items]                                          
Stock Repurchased During Period, Shares | shares           11.5                              
Legacy Black Sky [Member]                                          
Debt Instrument [Line Items]                                          
Notes Payable, Related Parties         $ 10,000,000.0             $ 10,000,000.0                  
Interest rate         6.00%             6.00%                  
Seahawk L S A [Member] | Loan From Related Party [Member]                                          
Debt Instrument [Line Items]                                          
Line of Credit Facility, Maximum Amount Outstanding During Period         $ 31,600,000                                
Seahawk L S A [Member] | Loan From Related Party [Member] | Seahawk SPV Investment L L C [Member]                                          
Debt Instrument [Line Items]                                          
Line of Credit Facility, Maximum Amount Outstanding During Period         17,600,000                                
Seahawk L S A [Member] | Loan From Related Party [Member] | Investor [Member]                                          
Debt Instrument [Line Items]                                          
Line of Credit Facility, Maximum Amount Outstanding During Period         14,000,000.0                                
Intelsat Facility [Member] | Loan From Related Party [Member] | Intelsat Jackson Holdings S A [Member]                                          
Debt Instrument [Line Items]                                          
Debt Instrument Maximum Borrowing Threshold Limit         110,000,000.0             $ 110,000,000.0                  
Intelsat Facility [Member] | Loan From Related Party [Member] | Intelsat Jackson Holdings S A [Member] | Commercial Credit Facility [Member]                                          
Debt Instrument [Line Items]                                          
Line of Credit Facility, Maximum Borrowing Capacity         25,000,000.0             25,000,000.0                  
Bridge Notes Payable [Member]                                          
Debt Instrument [Line Items]                                          
Debt Issuance Costs, Net     $ 47,600,000           $ 100,000                        
Gain on debt extinguishment                         (75,000) $ 0 (75,000) $ 0          
Delayed Draw Term Loan [Member] | Seahawk L S A [Member] | Loan From Related Party [Member] | Seahawk SPV Investment L L C [Member]                                          
Debt Instrument [Line Items]                                          
Debt principal amount               $ 50,000,000.0                          
Debt Instrument, Description of Variable Rate Basis               six                          
Related Party Loans [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Gross       $ 83,737,000                 $ 81,237,000   $ 81,237,000   $ 83,737,000 80,946,000      
Related Party Loans [Member] | Maximum [Member]                                          
Debt Instrument [Line Items]                                          
Debt Instrument, Interest Rate, Effective Percentage       6.00%                 6.00%   6.00%   6.00%        
Related Party Loans [Member] | Minimum [Member]                                          
Debt Instrument [Line Items]                                          
Debt Instrument, Interest Rate, Effective Percentage       4.00%                 4.00%   4.00%   4.00%        
Related Party Loans [Member] | Seahawk L S A [Member] | Loan From Related Party [Member]                                          
Debt Instrument [Line Items]                                          
Principal Amount Subject To Rolling         17,600,000             17,600,000                  
Interest Amount Subject To Rolling         $ 800,000             800,000                  
Related Party Loans [Member] | Two Thousand And Nineteen Omnibus Agreement [Member] | Series C Redeemable Convertible Preferred Stock [Member]                                          
Debt Instrument [Line Items]                                          
Debt Instrument, Convertible, Type of Equity Security         other than the Seahawk LSA debt held by Seahawk, all debt under the Seahawk LSA converted into shares of Series C redeemable convertible preferred stock                                
Related Party Loans [Member] | Intelsat Facility [Member] | Loan From Related Party [Member] | Intelsat Jackson Holdings S A [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Gross       $ 71,200,000                         $ 71,200,000        
Long Term Debt Amount Of Folding         $ 18,400,000             $ 18,400,000                  
Long-term Debt, Maturity Date         Oct. 31, 2024             Oct. 31, 2024                  
Debt Instrument, Frequency of Periodic Payment         Thereafter, interest is payable in cash semi-annually in arrears commencing on May 1, 2023.                                
Debt Instrument, Collateral         The Intelsat Facility is secured by substantially all of the Company’s assets and is guaranteed by the Company’s subsidiaries; such guarantee is secured by substantially all of the assets of the subsidiaries.                                
Debt Instrument, Covenant Compliance       There are no covenants tied to financial metrics and the Company was in compliance with the Intelsat Facility as of December 31, 2020.                                  
Debt Issuance Costs, Net       $ 1,800,000                         1,800,000        
Long-term Debt, Current Maturities       0                         0        
Related Party Loans [Member] | Intelsat Facility [Member] | Loan From Related Party [Member] | Intelsat Jackson Holdings S A [Member] | Applicable From Year One To Three [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate         4.00%             4.00%                  
Related Party Loans [Member] | Intelsat Facility [Member] | Loan From Related Party [Member] | Intelsat Jackson Holdings S A [Member] | Applicable Through Year Four [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate         9.00%             9.00%                  
Related Party Loans [Member] | Intelsat Facility [Member] | Loan From Related Party [Member] | Intelsat Jackson Holdings S A [Member] | Applicable Through Year Five [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate         10.00%             10.00%                  
Secured Term Loan [Member] | Intelsat Facility [Member] | Loan From Related Party [Member] | Intelsat Jackson Holdings S A [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Gross         $ 50,000,000.0             $ 50,000,000.0                  
Commercial Paper [Member] | Andrews Notes [Member] | Loan From Related Party [Member] | Jason [Member]                                          
Debt Instrument [Line Items]                                          
Notes Payable, Related Parties           $ 6,200,000                              
Commercial Paper [Member] | Andrews Notes [Member] | Loan From Related Party [Member] | Marian Joh Andrews [Member]                                          
Debt Instrument [Line Items]                                          
Notes Payable, Related Parties           6,200,000                              
Commercial Paper [Member] | Andrews Notes [Member] | Loan From Related Party [Member] | Jason And Marian Joh Andrews. [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Gross       12,500,000   $ 12,500,000                     12,500,000        
Debt Instrument, Frequency of Periodic Payment           annually                              
Debt Instrument, Periodic Payment, Interest           $ 25,000.0                              
Related Party Transaction, Rate           6.00%                              
Paycheck Protection Program Loan [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Gross       $ 3,600,000                 $ 0   $ 0   $ 3,600,000        
Debt Instrument, Interest Rate, Effective Percentage       1.86%                 1.86%   1.86%   1.86%        
Paycheck Protection Program Loan [Member] | Covid Nineteen [Member]                                          
Debt Instrument [Line Items]                                          
Debt principal amount                     $ 0                    
Debt Instrument, Covenant Compliance       There are no covenants tied to financial metrics and the Company was in compliance with the PPP loan as of December 31, 2020.                                  
Proceeds from Issuance of Long-term Debt                     $ 3,600,000                    
Debt Instrument, Payment Terms                     The amount of loan forgiveness will be reduced if the borrower terminates employees or reduces salaries during the forgiveness period. Any unforgiven portion of the PPP loan would be primarily payable over two years, with certain amounts due over an incremental three years, at an interest rate of 1%, with a deferral of payments for the first six months                    
Debt Instrument, Interest Rate, Effective Percentage                     1.00%                    
Term Loan [Member] | Amended And Restated Loan And Security Agreement [Member] | S V B [Member]                                          
Debt Instrument [Line Items]                                          
Debt principal amount             $ 15,000,000.0                            
Revolving Credit Facility [Member] | S V B [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Gross       $ 16,100,000                         $ 16,100,000        
Debt Instrument, Covenant Compliance       There are no covenants tied to financial metrics and the Company was in compliance with the SVB line of credit as of December 31, 2020                                  
Current portion of long-term debt       $ 28,600,000                         $ 28,600,000        
Line of Credit Facility, Collateral                       After amending the line of credit in October 2019, the line of credit is secured by certain pledged cash collateral accounts, guaranteed by the Company’s subsidiaries and guaranteed by certain of its investors                  
Revolving Credit Facility [Member] | Amended And Restated Loan And Security Agreement [Member] | S V B [Member]                                          
Debt Instrument [Line Items]                                          
Line of Credit Facility, Maximum Borrowing Capacity             $ 17,000,000.0                            
Line of Credit Facility, Interest Rate Description             The interest rate on the revolving line of credit is the current prime rate                            
Line of Credit Facility, Expiration Date             Jun. 30, 2021                            
Secured Debt [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Gross                                   $ 26,000,000      
Secured Debt [Member] | Bridge Agreement Loan [Member]                                          
Debt Instrument [Line Items]                                          
Long-term Debt, Gross         $ 26,000,000.0             $ 26,000,000.0                  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate         9.00%             9.00%                  
Debt Instrument, Frequency of Periodic Payment         semi-annually and in arrears commencing May 1, 2020                                
Debt Instrument, Collateral         The Bridge Loan was secured by substantially all of the Company’s assets and guaranteed by the Company’s subsidiaries, and such guarantee was secured by substantially all of the assets of the subsidiaries.                                
Long Term Debt Percentage Bearing Fixed Interest Rate Percentage Rate Payable In Cash         6.00%             6.00%                  
Long Term Debt Percentage Bearing Fixed Interest Rate Percentage Rate On Maturity         3.00%             3.00%                  
Convertible Debt [Member] | Bridge Notes Payable [Member]                                          
Debt Instrument [Line Items]                                          
Debt principal amount                 $ 500,000 $ 18,100,000                 $ 40,000,000.0 $ 60,000,000  
Debt conversion, shares ratio     7                                    
Convertible debt, remaining amount                                     1,900,000    
Interest rate                                       10.00%  
Threshold percentage of stock price trigger 80.00%                                        
Convertible Debt [Member] | Bridge Notes Payable Tranche One [Member]                                          
Debt Instrument [Line Items]                                          
Debt principal amount     $ 18,100,000                                    
Debt conversion, shares ratio     7                                    
Debt conversion, warrants issued, factor amount     $ 1,000,000.0                                    
Convertible Debt [Member] | Bridge Notes Payable Tranche One [Member] | Maximum [Member]                                          
Debt Instrument [Line Items]                                          
Debt conversion, warrants issued, percent     3.5                                    
Convertible Debt [Member] | Bridge Notes Payable Tranche One [Member] | Minimum [Member]                                          
Debt Instrument [Line Items]                                          
Debt conversion, warrants issued, percent     0.14                                    
Convertible Debt [Member] | Bridge Notes Payable Tranche Two Member [Member]                                          
Debt Instrument [Line Items]                                          
Debt principal amount                                     40,000,000.0    
Convertible Debt [Member] | Bridge Notes Payable Tranche Three [Member]                                          
Debt Instrument [Line Items]                                          
Debt principal amount                                     $ 500,000    
Debt conversion, shares ratio                 7                        
Subsequent Event [Member] | Commercial Paper [Member] | Andrews Notes [Member] | Loan From Related Party [Member] | Jason And Marian Joh Andrews. [Member]                                          
Debt Instrument [Line Items]                                          
Notes Payable, Related Parties   $ 1,800,000                                      
Repayments of Related Party Debt   $ 800,000