Annual report pursuant to Section 13 and 15(d)

Quarterly Operating Results (Unaudited) - Summary of Quarterly Results of Operations (Details)

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Quarterly Operating Results (Unaudited) - Summary of Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]                      
Revenue $ 60,231 $ 49,712 $ 54,014 $ 57,290 $ 37,277 $ 49,884 $ 45,868 $ 37,993 $ 221,247 $ 171,022 $ 286,326
Gross profit (loss) (3,964) (3,212) (699) 679 (25,914) (494) (11,620) (4,897) (7,196) (42,925) 24,853
Net income (loss) $ (4,682) $ (10,949) $ 549 $ (5,296) $ (24,279) $ (3,110) $ (10,923) $ (6,454) $ (20,378) $ (44,766) $ 3,515
Basic and diluted EPS (in dollars per share) $ (0.31) $ (0.73) $ 0.04 $ (0.36) $ (1.63) $ (0.21) $ (0.73) $ (0.45) $ (1.36) $ (3.02) $ 0.24
Increase in operating loss due to change in estimates                 $ 9,100   $ 1,800
Proceeds collection of receivables $ 2,800                    
Gain on sale 4,100               (268) $ 35 $ 757
Loss related to cost overruns and re-work         $ 34,500         34,500  
Impairment charges related to inventory and assets 3,000                    
Shipyard                      
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]                      
Increase in operating loss due to change in estimates $ 5,800               $ 6,700 $ 34,500