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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of revenue
Incremental costs of obtaining a contract	true
Term Of Product Warranty	1 year
Product sales	$ 165,995	$ 147,502
Dealer commission, reimbursed dealer expenses and other similar costs	11,303	24,165
Revenue from contract with customer product and service benchmark | Customer concentration risk | Independent third party and affiliates
Disaggregation of revenue
Product sales	$ 9,165	$ 41,263
Concentration risk percentage	5.50%	28.70%

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