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Segment Reporting and Geographic Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
item
segment
Jun. 30, 2017
USD ($)
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 $ 157,779 $ 112,218 $ 316,353 $ 206,717
United States        
Revenue reporting by end-market and geographic region        
Sale by end-market 32,939 20,860 56,694 37,906
China        
Revenue reporting by end-market and geographic region        
Sale by end-market 70,457 27,644 145,850 68,165
EMEA        
Revenue reporting by end-market and geographic region        
Sale by end-market [1] 25,405 14,752 41,151 37,192
Rest of World        
Revenue reporting by end-market and geographic region        
Sale by end-market 28,978 48,962 72,658 63,454
Advanced Packaging, MEMS & RF Filters        
Revenue reporting by end-market and geographic region        
Sale by end-market 24,758 21,827 51,911 32,738
LED Lighting, Display & Compound Semiconductor        
Revenue reporting by end-market and geographic region        
Sale by end-market 87,817 54,310 177,733 109,458
Front-End Semiconductor        
Revenue reporting by end-market and geographic region        
Sale by end-market 18,152 10,322 27,609 11,480
Scientific & Industrial        
Revenue reporting by end-market and geographic region        
Sale by end-market $ 27,052 $ 25,759 $ 59,100 $ 53,041
[1] EMEA consists of Europe, the Middle East, and Africa