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NATURE OF OPERATIONS - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue
Product sales	$ 31,195	$ 31,550
Incremental costs of obtaining a contract	true
Dealer commission, reimbursed dealer expenses and other similar costs	$ 4,907	4,327
Revenue from contract with customer product and service benchmark | Customer concentration risk | Independent third party and affiliates
Disaggregation of Revenue
Product sales	$ 11,986	$ 4,803
Concentration risk percentage	37.20%	15.90%

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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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