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Summary of Significant Accounting Policies - Fair Value Rollforward (Details) - Redeemable convertible preferred stock outstanding - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning of the period $ 177 $ 870
Exercised (113) (508)
Cancelled (16) 0
Change in fair value (48) (185)
End of the period $ 0 $ 177