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Segment Reporting and Geographic Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Revenue reporting by end-market and geographic region                      
Number of operating segments | segment                 1    
Number of reportable segments | segment                 1    
Sale by end-market $ 143,432 $ 131,872 $ 115,066 $ 94,386 $ 93,609 $ 85,482 $ 75,348 $ 78,011 $ 484,756 $ 332,451 $ 477,038
Long-Lived Tangible Assets 85,058       60,646       85,058 60,646 79,590
United States                      
Revenue reporting by end-market and geographic region                      
Sale by end-market                 94,936 85,637 86,627
Long-Lived Tangible Assets 81,046       60,012       81,046 60,012 64,951
China                      
Revenue reporting by end-market and geographic region                      
Sale by end-market                 107,844 85,834 242,442
Long-Lived Tangible Assets 64       219       64 219 422
EMEA                      
Revenue reporting by end-market and geographic region                      
Sale by end-market                 76,636 83,410 64,019
Long-Lived Tangible Assets 231       93       231 93 96
Rest of World                      
Revenue reporting by end-market and geographic region                      
Sale by end-market                 205,340 77,570 83,950
Long-Lived Tangible Assets $ 3,717       $ 322       3,717 322 14,121
LED Lighting, Display, & Compound Semiconductor                      
Revenue reporting by end-market and geographic region                      
Sale by end-market                 253,785 144,675 291,133
Advanced Packaging, MEMS & RF Filters                      
Revenue reporting by end-market and geographic region                      
Sale by end-market                 69,353 68,304 61,935
Scientific & Industrial                      
Revenue reporting by end-market and geographic region                      
Sale by end-market                 120,788 111,198 118,132
Front-End Semiconductor                      
Revenue reporting by end-market and geographic region                      
Sale by end-market                 $ 40,830 $ 8,274 $ 5,838