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Summary of Significant Accounting Policies - Concentration Risk (Details) - segment
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Concentration Risk [Line Items]    
Number of reportable segments 2  
U.S. Department Of Defense | Revenue from Contract with Customer Benchmark | Government Contracts Concentration Risk    
Concentration Risk [Line Items]    
Concentration risk, percentage 86.00% 84.00%
International And Commercial Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk    
Concentration Risk [Line Items]    
Concentration risk, percentage 14.00% 16.00%