Quarterly report pursuant to Section 13 or 15(d)

Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Disaggregation of Revenue (Details)

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Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue $ 19,587 $ 25,306 $ 67,640 $ 94,973
Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue   (446) (493) (1,413)
Shipyard | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 2,302 7,515 10,561 18,100
F&S | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 17,285 18,237 57,572 78,286
Fixed-price and unit-rate        
Disaggregation of Revenue [Line Items]        
Revenue 10,390 17,959 40,839 73,630
Fixed-price and unit-rate | Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue   (20) (8) (344)
Fixed-price and unit-rate | Shipyard | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 2,202 7,515 10,461 18,100
Fixed-price and unit-rate | F&S | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 8,188 10,464 30,386 55,874
T&M        
Disaggregation of Revenue [Line Items]        
Revenue 8,527 5,800 24,050 17,180
T&M | Shipyard | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 100   100  
T&M | F&S | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 8,427 5,800 23,950 17,180
Other        
Disaggregation of Revenue [Line Items]        
Revenue 670 1,547 2,751 4,163
Other | Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue   (426) (485) (1,069)
Other | F&S | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 670 $ 1,973 $ 3,236 $ 5,232