Segment Information (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Major Customer Disclosure
Revenue	$ 59,930	$ 58,297	$ 123,919	$ 106,681
USA
Major Customer Disclosure
Revenue	32,014	29,964	66,802	64,203
Taiwan
Major Customer Disclosure
Revenue	3,752	12,760	10,816	14,861
South Korea
Major Customer Disclosure
Revenue	701	758	2,521	2,039
Japan
Major Customer Disclosure
Revenue	6,156	2,527	8,999	5,146
Europe
Major Customer Disclosure
Revenue	4,944	2,640	5,682	6,015
Canada
Major Customer Disclosure
Revenue	31	1,423	543	2,481
Singapore
Major Customer Disclosure
Revenue	8,802	4,725	16,432	6,609
Asia-Other
Major Customer Disclosure
Revenue	$ 3,530	$ 3,500	$ 12,124	$ 5,327