CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Concentration Risk [Line Items]
Revenues	$ 150,470	$ 134,000
South Korea [Member]
Concentration Risk [Line Items]
Revenues	89,687	67,975
China [Member]
Concentration Risk [Line Items]
Revenues	55,400	60,504
Japan [Member]
Concentration Risk [Line Items]
Revenues	1,053	1,315
Other Non-U.S. Locations [Member]
Concentration Risk [Line Items]
Revenues	300	825
Total Non-U.S. Locations [Member]
Concentration Risk [Line Items]
Revenues	146,440	130,619
United States [Member]
Concentration Risk [Line Items]
Revenues	$ 4,030	$ 3,381