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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,207	$ 3,056
Rental income	17,129	15,341
Total revenue	20,336	18,397
Compressors - sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,968	1,891
Flares - sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	46
Other (parts/rebuilds) - sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	925	774
Service and maintenance
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 314	$ 345

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