ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition and Deferred Commissions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred revenue	$ 8,200	$ 8,700
Deferred revenue associated with customer loyalty programs	7,033	8,073	$ 9,703
Deferred commissions	$ 3,229	$ 3,443
Customer returns, days after original sale date	90 days
Percentage of sale returns	1.50%