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Segment Information and Foreign Operations - Segment and Geographical Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
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 $ 20,269 $ 21,872 $ 20,495 $ 18,713 $ 18,057 $ 18,371 $ 21,010 $ 20,064 $ 81,349 $ 77,502 $ 83,499
Long-lived assets by geographic region, net of depreciation:                      
Long-lived assets 27,805       31,422       27,805 31,422  
China                      
Long-lived assets by geographic region, net of depreciation:                      
Long-lived assets 27,487       30,880       27,487 30,880  
North America                      
Long-lived assets by geographic region, net of depreciation:                      
Long-lived assets $ 318       $ 542       318 542  
Reportable Geographical Components | Europe                      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]                      
Revenue                 18,637 19,518 21,535
Reportable Geographical Components | China                      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]                      
Revenue                 17,448 13,728 17,451
Reportable Geographical Components | Taiwan                      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]                      
Revenue                 15,369 13,799 11,464
Reportable Geographical Components | Japan                      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]                      
Revenue                 11,015 9,138 11,550
Reportable Geographical Components | Asia Pacific (excluding China, Taiwan, and Japan)                      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]                      
Revenue                 10,796 11,482 11,207
Reportable Geographical Components | North America                      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]                      
Revenue                 $ 8,084 $ 9,837 $ 10,292