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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue From Contract With Customer [Abstract] |
Summary of Disaggregated Revenue by Geographic Region | Total revenue based on the disaggregation criteria described above are as follows (in thousands):
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | Revenue |  |  | % of Revenue |  |  | Revenue |  |  | % of Revenue |  |  | Revenue |  |  | % of Revenue |
Revenue by primary geographical market: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North America |  | $ | 8,816 |  |  |  | 95 | % |  | $ | 4,225 |  |  |  | 88 | % |  | $ | 542 |  |  |  | 39 | %
Europe |  |  | 232 |  |  |  | 3 | % |  |  | 497 |  |  |  | 10 | % |  |  | 842 |  |  |  | 61 | %
Asia |  |  | 217 |  |  |  | 2 | % |  |  | 121 |  |  |  | 2 | % |  |  | — |  |  |  | 0 | %
Total |  | $ | 9,265 |  |  |  | 100 | % |  | $ | 4,843 |  |  |  | 100 | % |  | $ | 1,384 |  |  |  | 100 | %
Revenue by timing of recognition: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized at a point in time |  | $ | 1,776 |  |  |  | 19 | % |  | $ | 1,534 |  |  |  | 32 | % |  | $ | 819 |  |  |  | 59 | %
Recognized over time |  |  | 7,489 |  |  |  | 81 | % |  |  | 3,309 |  |  |  | 68 | % |  |  | 565 |  |  |  | 41 | %
Total |  | $ | 9,265 |  |  |  | 100 | % |  | $ | 4,843 |  |  |  | 100 | % |  | $ | 1,384 |  |  |  | 100 | %

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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