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SIGNIFICANT ACCOUNTING POLICIES - Basis of Consolidation and Presentation (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Concentration Risk [Line Items] |  |  |
Number of reportable segments | segment | 1 |  |
Net sales to all dealers | $ 239,825 | $ 292,136 | $ 298,616
Net sales | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, customer | 0 |  |
Percent of net sales | 10 |  |
Net sales | International dealers |  |  |
Concentration Risk [Line Items] |  |  |
Net sales to all dealers | $ 11,800 | $ 17,000 | $ 19,400

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