ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ (1,339)	$ (1,226)	$ (757)	$ (643)
Allowance for sales returns and exchanges	(9,003)	(9,916)	$ (7,861)	$ (8,583)
Accounts receivable, net	67,754	40,134
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	69,093	51,276
Allowance for doubtful accounts	(1,339)	(1,226)
Allowance for sales returns and exchanges	0	(9,916)
Accounts receivable, net	$ 67,754	$ 40,134