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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Sales Reserves (Details) - Reserve for sales returns
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Valuation and Qualifying Accounts Disclosure [Line Items]  
Balance at Beginning of Year $ 147
Provision related to sales made in current period 1,326
Adjustment related to sales made in prior periods (8)
Actual returns or credits related to current period (1,207)
Actual returns or credits related to prior periods (145)
Balance at End of Year $ 129