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Convertible Preferred Stock and Stockholders' Deficit - Summary of Restricted Shares of Common Stock and Unvested Stock Liability (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 USD ($) shares
Liabilities And Stockholders Equity [Line Items] |
Beginning Balance, Unvested stock liability | $ | $ 145
Vested shares, Unvested stock liability | $ | (8)
Ending Balance, Unvested stock liability | $ | $ 137
Restricted Shares |
Liabilities And Stockholders Equity [Line Items] |
Beginning Balance | shares | 646,953
Vested shares | shares | (216,540)
Ending Balance | shares | 430,413

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