ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued marketing expenses	$ 28,720	$ 25,959
Accrued compensation and other related costs	16,752	10,716
Accounts payable accruals	16,222	16,614
Allowance for returns	15,423	17,391
Other accrued expenses	7,193	6,283
Accrued freight	7,187	5,040
Accrued loss contingencies	608	608
Total accrued liabilities	$ 92,105	$ 82,611