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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Disaggregation of revenue
Product sales	$ 148,030	$ 143,196
Incremental costs of obtaining a contract	true
Dealer commission, reimbursed dealer expenses and other similar costs	$ 24,165	23,760
Revenue from contract with customer product and service benchmark | Customer concentration risk | Independent third party and affiliates
Disaggregation of revenue
Product sales	$ 41,263	$ 38,439
Concentration risk percentage	28.70%	26.80%
ASU 2014-09
Disaggregation of revenue
Impact of adoption			$ 0

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