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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Sales Returns (Details) - Allowance for Sales Returns
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Movement in Valuation Allowances and Reserves [Roll Forward]  
Sales reserves, beginning balance $ 117
Provision related to sales made in current period 690
Adjustment related to sales made in prior periods (11)
Actual returns or credits related to current period (585)
Actual returns or credits related to prior periods (106)
Sales reserves, ending balance $ 105