Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan - Summary of Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Beginning balance (in shares)	11,947,731
Granted (in shares)	481,403
Exercised (in shares)	(2,266,979)
Cancelled and forfeited (in shares)	(820,913)
Ending balance (in shares)	9,341,242	11,947,731
Vested and exercisable (in shares)	5,839,680
Weighted- Average Exercise Price
Beginning balance (in dollars per share)	$ 4.85
Granted (in dollars per share)	50.12
Exercised (in dollars per share)	2.57
Cancelled and forfeited (in dollars per share)	15.19
Ending Balance (in dollars per share)	6.83	$ 4.85
Vested and exercisable (in dollars per share)	$ 3.54
Ending balance, Weighted Average Remaining Contractual Life	6 years 6 months
Vested and exercisable, Weighted Average Remaining Contractual Life	5 years 3 months 18 days
Exercise, aggregate intrinsic value	$ 65,860	$ 5,200	$ 300
Outstanding ending balance, aggregate intrinsic value	109,971
Vested and exercisable, aggregate intrinsic value	$ 81,496
Weighted-average grant date fair value of options granted (in dollars per share)	$ 25.18	$ 11.51	$ 1.19

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.