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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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