ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued compensation and other related costs	$ 15,162	$ 12,099
Accrued loss contingencies	11,088	10,940
Allowance for returns	11,036	15,261
Sales and other taxes payable	10,543	9,923
Accrued marketing expenses	10,385	14,150
Accounts payable accruals	10,172	15,872
Accrued freight	7,058	5,343
Other accrued expenses	5,780	4,270
Total accrued liabilities	$ 81,224	$ 87,858