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Convertible Preferred Stock and Stockholders' Deficit (Tables)
9 Months Ended
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