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Stockholders' Equity - Early Exercise of Stock (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
shares
Common Class B  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares subject to repurchase (in shares) | shares 90,977
Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Plan modification, number of awards affected (in shares) | shares 47,882
Plan modification, exercise value of awards affected | $ $ 0.2
Other long-term liabilities | $ $ 0.4