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Segment Reporting and Geographic Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
item
segment
Jun. 30, 2018
USD ($)
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 $ 97,822 $ 157,779 $ 197,193 $ 316,353
United States        
Revenue reporting by end-market and geographic region        
Sale by end-market 39,784 32,939 72,099 56,694
China        
Revenue reporting by end-market and geographic region        
Sale by end-market 19,654 70,457 29,813 145,850
EMEA        
Revenue reporting by end-market and geographic region        
Sale by end-market 12,324 25,405 30,151 41,151
Rest Of World        
Revenue reporting by end-market and geographic region        
Sale by end-market 26,060 28,978 65,130 72,658
Advanced Packaging, MEMS & RF Filters        
Revenue reporting by end-market and geographic region        
Sale by end-market 16,443 24,758 39,570 51,911
LED Lighting, Display & Compound Semiconductor        
Revenue reporting by end-market and geographic region        
Sale by end-market 9,692 87,817 23,242 177,733
Front-End Semiconductor        
Revenue reporting by end-market and geographic region        
Sale by end-market 24,509 18,152 47,126 27,609
Scientific & Industrial        
Revenue reporting by end-market and geographic region        
Sale by end-market $ 47,178 $ 27,052 $ 87,255 $ 59,100