ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued compensation and other related costs	$ 18,224	$ 13,012
Accrued marketing expenses	12,109	13,063
Other accrued expenses	10,862	9,714
Allowance for returns	10,152	11,107	$ 15,261
Accounts payable accruals	9,855	15,692
Accrued loss contingencies	9,555	9,550
Sales and other taxes payable	9,058	10,105
Accrued freight	8,642	5,954
Total accrued liabilities	$ 88,457	$ 88,197