REVENUE - Contract With Customers (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Receivables, which comprises the balance in accounts receivable, net of allowances	$ 91,196	$ 142,804
Right of return assets, which are included in prepaid expenses and other current assets	431	2,177
Refund liabilities, which are included in sales return liability	23,175	39,790
Warranty liabilities, which are included in sales return liability	2,493	4,063
Contract liabilities, which are included in accrued liabilities	$ 30	$ 39