Stockholders' Equity and Stock-Based Compensation - Stock Option Activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Number of Shares
Outstanding, beginning balance ( in shares) | shares	16,170,000
Granted (in shares) | shares	8,599,000
Exercised (in shares) | shares	(3,957,000)
Forfeited (in shares) | shares	(787,000)
Outstanding, ending balance (in shares) | shares	20,025,000
Vested and expected (in shares) | shares	17,572,000
Exercisable (in shares) | shares	8,534,000
Weighted-Average Exercise Price
Outstanding beginning balance (in USD per share) | $ / shares	$ 2.69
Granted (in USD per share) | $ / shares	16.49
Exercised (in USD per share) | $ / shares	1.52
Forfeited (in USD per share) | $ / shares	11.33
Outstanding ending balance(in USD per share) | $ / shares	8.51
Vested and expected to vest (in USD per share) | $ / shares	7.92
Exercisable (in USD per share) | $ / shares	$ 4.63
Weighted-Average Remaining Contractual Life (in Years)
Outstanding at December 31, 2021	7 years 9 months 18 days
Vested and expected to vest at December 31, 2021	7 years 8 months 12 days
Exercisable at December 31, 2021	6 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding at December 31, 2021 | $	$ 60,223
Vested and expected to vest at December 31, 2021 | $	57,115
Exercisable at December 31, 2021 | $	$ 39,718