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v3.20.4

Segment Information (Geographic Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Revenue, net | $ 9,638 | $ 8,190 | $ 9,253 | $ 13,774 | $ 16,023 | $ 18,057 | $ 18,027 | $ 16,648 | $ 40,855 | $ 68,755
Japan |  |  |  |  |  |  |  |  |  |
Revenue, net |  |  |  |  |  |  |  |  | 26,554 | 53,628
China |  |  |  |  |  |  |  |  |  |
Revenue, net |  |  |  |  |  |  |  |  | 8,935 | 10,213
U.S. |  |  |  |  |  |  |  |  |  |
Revenue, net |  |  |  |  |  |  |  |  | 3,057 | 3,105
Taiwan |  |  |  |  |  |  |  |  |  |
Revenue, net |  |  |  |  |  |  |  |  | 1,668 | 1,597
Europe |  |  |  |  |  |  |  |  |  |
Revenue, net |  |  |  |  |  |  |  |  | 333 | 104
Korea |  |  |  |  |  |  |  |  |  |
Revenue, net |  |  |  |  |  |  |  |  | $ 308 | $ 108

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