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Consolidated Statements of Convertible Preferred Shares and Shareholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Series A Convertible Preferred Shares |  |  |
Stock issuance costs |  |  | $ 5
Series B Convertible Preferred Shares |  |  |
Stock issuance costs |  |  | $ 248
Initial Public Offering |  |  |
Stock issuance costs |  | $ 20,957 |
Follow On Offering |  |  |
Stock issuance costs | $ 840 |  |

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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