Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Inventory (Details)

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Summary of Significant Accounting Policies - Inventory (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Amortization of coil tubing strings $ 0 $ 359,000 $ 1,641,000
Coil Tubing Strings      
Property, Plant and Equipment [Line Items]      
Inventory useful life (no longer than) 12 months