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Segment Information - Geographic Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenue, net | $ 8,190 | $ 18,057 | $ 31,217 | $ 52,732
Japan |  |  |  |
Revenue, net | 5,296 | 14,119 | 21,297 | 42,814
China |  |  |  |
Revenue, net | 2,045 | 2,562 | 5,850 | 6,110
United States |  |  |  |
Revenue, net | 384 | 694 | 2,483 | 2,031
Korea |  |  |  |
Revenue, net | 275 | 15 | 308 | 108
Taiwan |  |  |  |
Revenue, net | 120 | 667 | 1,019 | 1,565
Europe |  |  |  |
Revenue, net | $ 70 | $ 0 | $ 260 | $ 104

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