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Segment Information and Foreign Operations - Segment and Geographical Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) segment | Sep. 30, 2020 USD ($) | Dec. 31, 2020 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 | $ 34,576 | $ 25,469 | $ 99,661 | $ 68,326 |
Long-lived assets by geographic region, net of depreciation: |  |  |  |  |
Long-lived assets | 134,018 |  | 134,018 |  | $ 118,508
Reportable Geographical Components | China |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 16,959 | 10,568 | 48,051 | 23,045 |
Long-lived assets by geographic region, net of depreciation: |  |  |  |  |
Long-lived assets | 132,642 |  | 132,642 |  | 117,672
Reportable Geographical Components | Taiwan |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 3,825 | 3,333 | 11,836 | 12,908 |
Reportable Geographical Components | Japan |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 3,393 | 2,233 | 8,551 | 5,265 |
Reportable Geographical Components | Asia Pacific (excluding China, Taiwan, and Japan) |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 1,946 | 1,446 | 5,159 | 4,503 |
Reportable Geographical Components | Europe (primarily Germany) |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 4,939 | 4,689 | 16,785 | 15,017 |
Reportable Geographical Components | North America (primarily the United States) |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 3,514 | $ 3,200 | 9,279 | $ 7,588 |
Long-lived assets by geographic region, net of depreciation: |  |  |  |  |
Long-lived assets | $ 1,376 |  | $ 1,376 |  | $ 836

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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