SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES Geographic Net Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue by Geography
Total net revenues	$ 173,737	$ 109,664
United States of America
Revenue by Geography
Total net revenues	4,100	2,713
Hong Kong/China
Revenue by Geography
Total net revenues	118,730	60,413
Taiwan
Revenue by Geography
Total net revenues	6,442	6,479
Korea
Revenue by Geography
Total net revenues	12,489	10,357
Western Europe (excluding Germany)
Revenue by Geography
Total net revenues	7,130	10,035
Japan
Revenue by Geography
Total net revenues	4,647	3,905
Germany
Revenue by Geography
Total net revenues	7,006	5,567
Other
Revenue by Geography
Total net revenues	$ 13,193	$ 10,195