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Basis of Presentation and Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenue from External Customer [Line Items]        
Net sales $ 2,915 $ 5,158 $ 9,174 $ 14,989
Commercial        
Revenue from External Customer [Line Items]        
Net sales 1,733 2,292 5,847 7,469
Military        
Revenue from External Customer [Line Items]        
Net sales $ 1,182 $ 2,866 $ 3,327 $ 7,520