ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accrued Expenses and Other Current Liabilities Disclosure [Abstract]
Accrued Professional Fees, Current	$ 1,136	$ 1,025
Operating Lease, Liability, Current	5,870	6,645
Accrued Royalties, Current	3,302	1,549
Product Warranty Accrual, Current	1,095	1,337
Restructuring Reserve	3,687	157
Allowance for Sales Returns and Exchanges	9,306	8,230	$ 9,003	$ 9,916
Other Accrued Liabilities, Current	17,868	17,816
Accrued expenses and other current liabilities	$ 42,264	$ 36,759