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Revenue Recognition - Schedule of Revenue Disaggregated by Source (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]    
Total revenues $ 41,550 $ 47,071
LNG Product    
Disaggregation of Revenue [Line Items]    
Total revenues 27,339 34,244
Rental    
Disaggregation of Revenue [Line Items]    
Total revenues 6,338 6,569
Service    
Disaggregation of Revenue [Line Items]    
Total revenues 1,128 991
Power Delivery    
Disaggregation of Revenue [Line Items]    
Total revenues 5,260 3,421
Other    
Disaggregation of Revenue [Line Items]    
Total revenues $ 1,485 $ 1,846