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NATURE OF OPERATIONS - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019
Disaggregation of revenue |  |  |  |  |
Product sales | $ 35,355 | $ 34,896 | $ 106,671 | $ 110,498 |
Incremental costs of obtaining a contract |  |  | true |  |
Dealer commission, reimbursed dealer expenses and other similar costs | 4,713 | 2,158 | $ 16,600 | 12,131 |
Revenue from contract with customer product and service benchmark | Customer concentration risk | Independent third party and affiliates |  |  |  |  |
Disaggregation of revenue |  |  |  |  |
Product sales | $ 13,027 | $ 1,653 | $ 26,350 | $ 3,365 |
Concentration risk percentage | 36.90% | 4.70% | 24.70% | 3.00% |
ASU 2014-09 |  |  |  |  |
Disaggregation of revenue |  |  |  |  |
Impact of adoption |  |  |  |  | $ 0

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