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Convertible Preferred Stock and Stockholders' Deficit (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Summary of Restricted Shares of Common Stock and Unvested Stock Liability | A summary of the Company’s restricted shares of common stock and unvested stock liability, which is included in accrued expenses and other current liabilities and other long-term liabilities on the Company’s balance sheets, is as follows (in thousands, except share data):
|  | Shares |  |  | Liability |
Balance at December 31, 2020 |  |  | 646,953 |  |  | $ | 145 |
Vested shares |  |  | (216,540 | ) |  |  | (8 | )
Balance at September 30, 2021 |  |  | 430,413 |  |  | $ | 137 |

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