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Investments in Foreign Joint Ventures - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Revenues	$ 16,052,000	$ 5,003,000	$ 33,716,000	$ 18,841,000
Affiliated Entity
Schedule of Equity Method Investments [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0
Bomay
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%		40.00%
Bomay | Baoji Oilfield Machinery Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	51.00%		51.00%
Bomay | AA Energies, Inc.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	9.00%		9.00%

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