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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,782	$ 2,136	$ 4,988	$ 5,192
Rental income	18,144	15,613	35,274	30,954
Total revenue	19,926	17,749	40,262	36,146
Compressors - sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	286	0	2,253	1,891
Flares - sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	83	29	83	75
Other (parts/rebuilds) - sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	923	1,544	1,848	2,318
Service and maintenance
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 490	$ 563	$ 804	$ 908

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