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Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - Schedule of Reconciliation of Shares Issued and Outstanding (Details) - Common Stock - shares | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Class of Stock [Line Items] |  |  |
Total shares of common stock legally issued and outstanding | 35,736,584 | 544,967 | 375,492
Less: unvested early exercised shares of common stock | 17,820 | 757 | 41,834
Total shares issued and outstanding | 35,718,764 | 544,210 | 333,658

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