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Segment Information and Foreign Operations - Segment and Geographical Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) segment | Jun. 30, 2015 USD ($) | 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 | $ 20,495 | $ 21,010 | $ 39,208 | $ 41,074 |
Long-lived assets by geographic region [Abstract] |  |  |  |  |
Long-lived assets | 30,178 |  | 30,178 |  | $ 31,422
Reportable Geographical Components | Taiwan |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 4,649 | 3,414 | 8,784 | 6,523 |
Reportable Geographical Components | Europe |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 4,573 | 5,664 | 8,951 | 10,607 |
Reportable Geographical Components | China |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 4,183 | 3,561 | 7,275 | 6,858 |
Long-lived assets by geographic region [Abstract] |  |  |  |  |
Long-lived assets | 29,259 |  | 29,259 |  | 30,880
Reportable Geographical Components | Japan |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 2,695 | 2,753 | 4,597 | 5,237 |
Reportable Geographical Components | North America |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 1,993 | 2,850 | 4,449 | 6,322 |
Long-lived assets by geographic region [Abstract] |  |  |  |  |
Long-lived assets | 919 |  | 919 |  | $ 542
Reportable Geographical Components | Asia Pacific (excluding China, Taiwan, and Japan) |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | $ 2,402 | $ 2,768 | $ 5,152 | $ 5,527 |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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