CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Concentration Risk [Line Items]
Total revenue	$ 141,077	$ 160,556	$ 418,109	$ 447,587
South Korea [Member]
Concentration Risk [Line Items]
Total revenue	87,231	100,555	235,320	269,338
China [Member]
Concentration Risk [Line Items]
Total revenue	48,687	52,906	163,634	159,486
Japan [Member]
Concentration Risk [Line Items]
Total revenue	2,019	2,011	5,175	4,456
Other Non-U.S. Locations [Member]
Concentration Risk [Line Items]
Total revenue	541	976	3,856	1,991
Total Non-U.S. Locations [Member]
Concentration Risk [Line Items]
Total revenue	138,478	156,448	407,985	435,271
United States [Member]
Concentration Risk [Line Items]
Total revenue	$ 2,599	$ 4,108	$ 10,124	$ 12,316