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Summary of Certain Significant Accounting Policies - Schedule of Revenue Disaggregated (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation Of Revenue [Line Items]        
Net sales $ 2,075 $ 1,331 $ 3,951 $ 2,546
International        
Disaggregation Of Revenue [Line Items]        
Net sales 2,075 1,331 3,951 2,546
Oil & Gas        
Disaggregation Of Revenue [Line Items]        
Net sales 1,390 1,188 2,572 2,209
Oil & Gas | International        
Disaggregation Of Revenue [Line Items]        
Net sales 1,390 1,188 2,572 2,209
Power Generation & Distribution        
Disaggregation Of Revenue [Line Items]        
Net sales 228 133 322 230
Power Generation & Distribution | International        
Disaggregation Of Revenue [Line Items]        
Net sales 228 133 322 230
Marine & Other Industrial        
Disaggregation Of Revenue [Line Items]        
Net sales 457 10 1,057 107
Marine & Other Industrial | International        
Disaggregation Of Revenue [Line Items]        
Net sales $ 457 $ 10 $ 1,057 $ 107