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Revenues By Geographic Areas (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
United States |  |
Revenues: (in thousands) | $ 12,137 | $ 14,558
Europe |  |
Revenues: (in thousands) | 2,209 | 2,431
Asia and rest of world |  |
Revenues: (in thousands) | 1,354 | 2,264
Total |  |
Revenues: (in thousands) | $ 15,700 | $ 19,253

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