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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Dealer Incentive Liability, Advertising Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dealer Incentive Liability    
Dealer incentive liability $ 5,531 $ 6,115
Dealer incentive expense $ 731 $ 829