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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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