Revenue Recognition - Schedule of Revenue Disaggregated by Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 9,019	$ 10,514	$ 27,860	$ 34,584
LNG Product
Disaggregation of Revenue [Line Items]
Total revenues	6,594	7,919	18,609	26,872
Rental
Disaggregation of Revenue [Line Items]
Total revenues	737	759	4,012	4,340
Service
Disaggregation of Revenue [Line Items]
Total revenues	187	7	593	689
Power Delivery
Disaggregation of Revenue [Line Items]
Total revenues	1,352	1,371	3,638	1,371
Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 149	$ 458	$ 1,008	$ 1,312