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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Sales Reserves (Details) - Reserve for sales returns - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Movement in Valuation Allowances and Reserves [Roll Forward]    
Balance at Beginning of Year $ 117 $ 129
Provision related to sales made in current period 1,198 1,274
Adjustment related to sales made in prior periods (10) 3
Actual returns or credits related to current period (1,125) (1,156)
Actual returns or credits related to prior periods (104) (133)
Balance at End of Year $ 76 $ 117