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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Disaggregation of revenue |  |  |
Product sales | $ 143,196 | $ 139,165 |
Incremental costs of obtaining a contract | true |  |
Dealer commission, reimbursed dealer expenses and other similar costs | $ 23,760 | 20,419 |
Revenue from contract with customer product and service benchmark | Customer concentration risk | Independent third party and affiliates |  |  |
Disaggregation of revenue |  |  |
Product sales | $ 38,439 | $ 5,462 |
Concentration risk percentage | 26.80% | 3.90% |
ASU 2014-09 |  |  |
Disaggregation of revenue |  |  |
Impact of adoption |  |  | $ 0

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