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Stock Based Awards - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Outstanding at beginning of period	3,663
Options, Retroactive conversion of shares due to business combination	23,928
Options, Outstanding converted	27,591
Options,granted	1,559
Options, excercised	1,795
Options,forfeited	(703)
Options, Outstanding at end of period	26,652	3,663
Options, exercisable	17,941
Options, Vested and expected to vest	26,652
Weighted Average Exercise Price
Weighted average exercise price per share, outstanding beginning of period	$ 5.09
Weighted Average Exercise Price per share, retroactive conversion of shares due to business combination	(4.41)
Weighted average exercise price per share, Outstanding converted	0.68
Weighted average exercise price per share, Granted	1.22
Weighted average exercise price per share, Exercised	0.35
Weighted average exercise price per share, Forfeited	0.65
Weighted average exercise price per share, Outstanding at end of period	0.73	$ 5.09
Weighted average exercise price per share, Exercisable	0.58
Weighted average exercise price per share, Vested and expected to vest	$ 0.73
Weighted average remaining contractual term	7 years 1 month 2 days	7 years 4 months 24 days
Weighted average remaining contractual term, Outstanding converted		7 years 4 months 24 days
Weighted average remaining contractual term, Exercisable	6 years 4 months 17 days
Weighted average remaining contractual term, Vested and expected to vest	7 years 1 month 2 days
Aggregate intrinsic value, Outstanding beginning of period	$ 14,619
Aggregate intrinsic value, Outstanding converted	14,619
Aggregate intrinsic value, Outstanding end of period	145,943	$ 14,619
Aggregate intrinsic value, Exercisable	78,143
Aggregate intrinsic value, Vested and expected to vest	$ 145,943
Options Issued Under Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Outstanding at beginning of period	3,462
Options, Retroactive conversion of shares due to business combination	22,613
Options, Outstanding converted	26,075
Options,granted	1,559
Options, excercised	1,252
Options,forfeited	(521)
Options, Outstanding at end of period	25,861	3,462
Nonemployee Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Outstanding at beginning of period	201
Options, Retroactive conversion of shares due to business combination	1,315
Options, Outstanding converted	1,516
Options,granted
Options, excercised	543
Options,forfeited	(182)
Options, Outstanding at end of period	791	201

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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