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Segment Reporting and Geographic Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
item
Sep. 30, 2018
USD ($)
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 $ 108,954 $ 126,757 $ 306,147 $ 443,110
United States        
Revenue reporting by end-market and geographic region        
Sale by end-market 27,915 28,861 100,014 85,555
China        
Revenue reporting by end-market and geographic region        
Sale by end-market 17,034 39,200 46,846 185,050
EMEA        
Revenue reporting by end-market and geographic region        
Sale by end-market 19,128 30,685 49,280 71,836
Rest Of World        
Revenue reporting by end-market and geographic region        
Sale by end-market 44,877 28,011 110,007 100,669
Advanced Packaging, MEMS & RF Filters        
Revenue reporting by end-market and geographic region        
Sale by end-market 11,381 24,562 50,951 76,473
LED Lighting, Display & Compound Semiconductor        
Revenue reporting by end-market and geographic region        
Sale by end-market 24,020 58,864 47,263 236,597
Front-End Semiconductor        
Revenue reporting by end-market and geographic region        
Sale by end-market 33,578 13,476 80,703 41,085
Scientific & Industrial        
Revenue reporting by end-market and geographic region        
Sale by end-market $ 39,975 $ 29,855 $ 127,230 $ 88,955