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Segment Reporting and Geographic Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment item	Jun. 30, 2019 USD ($)
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	$ 98,637	$ 97,822	$ 203,139	$ 197,193
United States
Revenue reporting by end-market and geographic region
Sale by end-market	29,632	39,784	69,268	72,099
China
Revenue reporting by end-market and geographic region
Sale by end-market	17,393	19,654	27,865	29,813
EMEA
Revenue reporting by end-market and geographic region
Sale by end-market	26,130	12,324	42,280	30,151
Rest Of World
Revenue reporting by end-market and geographic region
Sale by end-market	25,482	26,060	63,726	65,130
Front-End Semiconductor
Revenue reporting by end-market and geographic region
Sale by end-market	17,759	24,509	49,125	47,126
Advanced Packaging, MEMS & RF Filters
Revenue reporting by end-market and geographic region
Sale by end-market	21,454	16,443	30,042	39,570
LED Lighting, Display & Compound Semiconductor
Revenue reporting by end-market and geographic region
Sale by end-market	16,017	9,692	31,419	23,242
Scientific & Industrial
Revenue reporting by end-market and geographic region
Sale by end-market	$ 43,407	$ 47,178	$ 92,553	$ 87,255