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Segment Reporting and Geographic Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) item segment	Sep. 30, 2019 USD ($)
Revenue reporting by end-market and geographic region
Number of operating segments \| segment			1
Number of reportable segments \| segment			1
Number of key markets \| item			4
Sale by end-market	$ 112,078	$ 108,954	$ 315,216	$ 306,147
United States
Revenue reporting by end-market and geographic region
Sale by end-market	39,602	27,915	108,869	100,014
China
Revenue reporting by end-market and geographic region
Sale by end-market	10,464	17,034	38,328	46,846
EMEA
Revenue reporting by end-market and geographic region
Sale by end-market	14,991	19,128	57,271	49,280
Rest Of World
Revenue reporting by end-market and geographic region
Sale by end-market	47,021	44,877	110,748	110,007
Front-End Semiconductor
Revenue reporting by end-market and geographic region
Sale by end-market	20,789	33,578	69,914	80,703
LED Lighting, Display & Compound Semiconductor
Revenue reporting by end-market and geographic region
Sale by end-market	20,098	24,020	51,516	47,263
Scientific & Industrial
Revenue reporting by end-market and geographic region
Sale by end-market	52,479	39,975	145,033	127,230
Advanced Packaging, MEMS & RF Filters
Revenue reporting by end-market and geographic region
Sale by end-market	$ 18,712	$ 11,381	$ 48,753	$ 50,951