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Segment Reporting and Geographic Information - Geographic (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue reporting by end-market and geographic region                      
Net sales $ 98,972 $ 126,757 $ 157,779 $ 158,574 $ 139,661 $ 129,308 $ 112,218 $ 94,499 $ 542,082 $ 475,686 $ 331,702
Long-lived Tangible Assets 80,284       85,058       80,284 85,058 60,646
United States                      
Revenue reporting by end-market and geographic region                      
Net sales                 125,659 93,433 85,582
Long-lived Tangible Assets 78,503       81,046       78,503 81,046 60,012
China                      
Revenue reporting by end-market and geographic region                      
Net sales                 194,032 106,674 84,604
Long-lived Tangible Assets 81       64       81 64 219
EMEA                      
Revenue reporting by end-market and geographic region                      
Net sales                 89,102 72,979 84,181
Long-lived Tangible Assets 205       231       205 231 93
Rest Of World                      
Revenue reporting by end-market and geographic region                      
Net sales                 133,289 202,600 77,335
Long-lived Tangible Assets $ 1,495       $ 3,717       $ 1,495 $ 3,717 $ 322