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Stock-Based Compensation - Early Exercise of Common Stock Options (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]    
Shares subject to repurchase obligation (in shares) 1,819,558 162,317
Fair value of shares subject to repurchase obligation $ 7.0 $ 0.3