ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ (1,226)	$ (757)	$ (643)	$ (1,182)
Allowance for sales returns and exchanges	(9,916)	(7,861)	$ (8,583)	$ (9,510)
Accounts receivable, net	40,134	43,520
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	51,276	52,138
Allowance for doubtful accounts	(1,226)	(757)
Allowance for sales returns and exchanges	(9,916)	(7,861)
Accounts receivable, net	$ 40,134	$ 43,520