VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 2,080	$ 610	$ 431
Additions charged (credited) to costs and expenses	140	1,776	43
Adjustments/deductions	(128)	(306)	136
Ending balance	2,092	2,080	610
Inventory Reserve
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	4,281	2,575	2,315
Additions charged (credited) to costs and expenses	5,964	7,069	898
Adjustments/deductions	(7,463)	(5,363)	(638)
Ending balance	$ 2,782	$ 4,281	$ 2,575