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Segment Information and Foreign Operations - Segment and Geographical Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]          
Number of operating segments | segment     1    
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue $ 28,168 $ 21,872 $ 72,341 $ 61,080  
Long-lived assets by geographic region, net of depreciation:          
Long-lived assets 42,255   42,255   $ 27,805
Reportable Geographical Components | China          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 7,203 4,766 17,949 12,041  
Long-lived assets by geographic region, net of depreciation:          
Long-lived assets 40,713   40,713   27,487
Reportable Geographical Components | Europe (primarily Germany)          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 6,192 4,995 17,638 13,946  
Reportable Geographical Components | Taiwan          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 5,986 2,995 13,499 11,779  
Reportable Geographical Components | Japan          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 3,694 3,499 9,696 8,096  
Reportable Geographical Components | Asia Pacific (excluding China, Taiwan, and Japan)          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 2,934 3,239 7,650 8,391  
Reportable Geographical Components | North America          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 2,159 $ 2,378 5,909 $ 6,827  
Long-lived assets by geographic region, net of depreciation:          
Long-lived assets $ 1,542   $ 1,542   $ 318