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NATURE OF OPERATIONS - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue
Product sales	$ 36,566	$ 35,355	$ 106,940	$ 106,671
Incremental costs of obtaining a contract			true
Dealer commission, reimbursed dealer expenses and other similar costs	7,073	4,713	$ 15,878	16,600
Revenue from contract with customer product and service benchmark | Customer concentration risk | Independent third party and affiliates
Disaggregation of Revenue
Product sales	$ 13,253	$ 13,027	$ 39,559	$ 26,350
Concentration risk percentage	36.20%	36.90%	37.00%	24.70%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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