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Segment Reporting and Geographic Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
item
segment
Mar. 31, 2019
USD ($)
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 $ 104,502 $ 99,371
United States    
Revenue reporting by end-market and geographic region    
Sale by end-market 39,635 32,315
China    
Revenue reporting by end-market and geographic region    
Sale by end-market 10,472 10,159
EMEA    
Revenue reporting by end-market and geographic region    
Sale by end-market 16,150 17,827
Rest Of World    
Revenue reporting by end-market and geographic region    
Sale by end-market 38,245 39,070
Front-End Semiconductor    
Revenue reporting by end-market and geographic region    
Sale by end-market 31,366 22,617
Advanced Packaging, MEMS & RF Filters    
Revenue reporting by end-market and geographic region    
Sale by end-market 8,588 23,127
LED Lighting, Display & Compound Semiconductor    
Revenue reporting by end-market and geographic region    
Sale by end-market 15,402 13,550
Scientific & Industrial    
Revenue reporting by end-market and geographic region    
Sale by end-market $ 49,146 $ 40,077