STOCKHOLDERS' EQUITY Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement, Expense	$ 3,580	$ 2,726	$ 6,702	$ 4,835
Restricted Stock Units (RSUs) [Member] | Time Based RSUs
Employee Benefits and Share-based Compensation	2,584	1,951
Restricted Stock Units (RSUs) [Member] | Performance-Based Vesting [Member]
Employee Benefits and Share-based Compensation	966	748
Employee Stock
Employee Benefits and Share-based Compensation	30	27
Cost of Products Revenues [Member]
Share-based Payment Arrangement, Expense	150	118	291	220
Cost of Services Revenues [Member]
Share-based Payment Arrangement, Expense	328	158	627	256
Research and Development Expense [Member]
Share-based Payment Arrangement, Expense	409	359	930	653
Selling and Marketing Expense [Member]
Share-based Payment Arrangement, Expense	617	581	1,219	1,022
General and Administrative Expense [Member]
Share-based Payment Arrangement, Expense	$ 2,076	$ 1,510	$ 3,635	$ 2,684