STOCKHOLDERS' EQUITY Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement, Expense	$ 3,122	$ 2,109
Restricted Stock Units (RSUs) [Member] | Time Based RSUs
Employee Benefits and Share-based Compensation	2,437	1,567
Restricted Stock Units (RSUs) [Member] | Performance-Based Vesting [Member]
Employee Benefits and Share-based Compensation	656	516
Employee Stock
Employee Benefits and Share-based Compensation	29	26
Cost of Products Revenues [Member]
Share-based Payment Arrangement, Expense	142	102
Cost of Services Revenues [Member]
Share-based Payment Arrangement, Expense	298	98
Research and Development Expense [Member]
Share-based Payment Arrangement, Expense	521	294
Selling and Marketing Expense [Member]
Share-based Payment Arrangement, Expense	602	441
General and Administrative Expense [Member]
Share-based Payment Arrangement, Expense	$ 1,559	$ 1,174