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Segment Reporting and Geographic Information - Segment (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Revenue reporting by end-market and geographic region                      
Number of operating segments | segment                 1    
Number of reportable segments | segment                 1    
Net sales $ 98,972 $ 126,757 $ 157,779 $ 158,574 $ 139,661 $ 129,308 $ 112,218 $ 94,499 $ 542,082 $ 475,686 $ 331,702
Advanced Packaging, MEMS & RF Filters                      
Revenue reporting by end-market and geographic region                      
Net sales                 90,775 67,406 67,484
LED Lighting, Display & Compound Semiconductor                      
Revenue reporting by end-market and geographic region                      
Net sales                 249,974 248,615 145,701
Front-End Semiconductor                      
Revenue reporting by end-market and geographic region                      
Net sales                 62,582 40,319 8,427
Scientific & Industrial                      
Revenue reporting by end-market and geographic region                      
Net sales                 $ 138,751 $ 119,346 $ 110,090