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Segment Information and Foreign Operations - Segment and Geographical Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 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 | $ 26,332 | $ 28,168 | $ 23,557 | $ 20,616 | $ 20,269 | $ 21,872 | $ 20,495 | $ 18,713 | $ 98,673 | $ 81,349 | $ 77,502
Long-lived assets by geographic region, net of depreciation: |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 46,530 |  |  |  | 27,805 |  |  |  | 46,530 | 27,805 |
China |  |  |  |  |  |  |  |  |  |  |
Long-lived assets by geographic region, net of depreciation: |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 45,120 |  |  |  | 27,487 |  |  |  | 45,120 | 27,487 |
North America |  |  |  |  |  |  |  |  |  |  |
Long-lived assets by geographic region, net of depreciation: |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 1,410 |  |  |  | $ 318 |  |  |  | 1,410 | 318 |
Reportable Geographical Components | China |  |  |  |  |  |  |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 24,962 | 17,448 | 13,728
Reportable Geographical Components | Europe (primarily Germany) |  |  |  |  |  |  |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 23,956 | 18,637 | 19,518
Reportable Geographical Components | Taiwan |  |  |  |  |  |  |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 18,279 | 15,369 | 13,799
Reportable Geographical Components | Japan |  |  |  |  |  |  |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 13,258 | 11,015 | 9,138
Reportable Geographical Components | Asia Pacific (excluding China, Taiwan, and Japan) |  |  |  |  |  |  |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 9,866 | 10,796 | 11,482
Reportable Geographical Components | North America |  |  |  |  |  |  |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 8,352 | $ 8,084 | $ 9,837

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