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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

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