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Segment Reporting and Geographic Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
item
segment
Sep. 30, 2016
USD ($)
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  
Net sales $ 131,872 $ 85,482 $ 341,324 $ 238,842
United States        
Revenue reporting by end-market and geographic region        
Net sales 34,723 19,104 73,256 66,550
China        
Revenue reporting by end-market and geographic region        
Net sales 15,197 21,238 81,811 54,621
EMEA        
Revenue reporting by end-market and geographic region        
Net sales [1] 17,243 19,703 57,312 61,999
Rest of World        
Revenue reporting by end-market and geographic region        
Net sales 64,709 25,437 128,945 55,672
LED Lighting, Display & Power Compound Semiconductor        
Revenue reporting by end-market and geographic region        
Net sales 59,721 49,427 170,546 97,985
Advanced Packaging, MEMS & RF Filters        
Revenue reporting by end-market and geographic region        
Net sales 22,775 12,092 55,756 52,400
Scientific & Industrial        
Revenue reporting by end-market and geographic region        
Net sales 33,145 20,997 86,917 82,726
Front-End Semiconductor        
Revenue reporting by end-market and geographic region        
Net sales $ 16,231 $ 2,966 $ 28,105 $ 5,731
[1] EMEA consists of Europe, the Middle East, and Africa