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v3.19.1

Segment Information and Foreign Operations - Segment and Geographical Information (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) segment | Mar. 31, 2018 USD ($) | Dec. 31, 2018 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 | $ 20,208 | $ 24,419 |
Long-lived assets by geographic region, net of depreciation: |  |  |
Long-lived assets | 86,011 |  | $ 82,280
Reportable Geographical Components | China |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |
Revenue | 7,111 | 7,183 |
Long-lived assets by geographic region, net of depreciation: |  |  |
Long-lived assets | 84,510 |  | 81,835
Reportable Geographical Components | Europe (primarily Germany) |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |
Revenue | 4,375 | 6,393 |
Reportable Geographical Components | Taiwan |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |
Revenue | 3,008 | 5,049 |
Reportable Geographical Components | North America (primarily the United States) |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |
Revenue | 2,738 | 1,845 |
Long-lived assets by geographic region, net of depreciation: |  |  |
Long-lived assets | 1,501 |  | $ 445
Reportable Geographical Components | Japan |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |
Revenue | 1,792 | 2,455 |
Reportable Geographical Components | Asia Pacific (excluding China, Taiwan, and Japan) |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |
Revenue | $ 1,184 | $ 1,494 |

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