Stock-based Compensation - Schedule of Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Outstanding, Beginning	17,801,986	11,913,780	5,738,520
Number of Options, Granted		7,393,347	7,089,185
Number of Options, Exercised	(3,701,243)	(351,037)	(243,780)
Number of Options, Forfeited	(242,387)	(1,006,417)	(539,751)
Number of Options, Expired	0	(147,687)	(130,394)
Number of Options, Outstanding, Ending	13,858,356	17,801,986	11,913,780	5,738,520
Number of Options, Vested and exercisable	9,678,341
Number of Options, Vested and expected to vest	13,858,356
Weighted- Average Exercise Price, Outstanding, Beginning	$ 0.36	$ 0.24	$ 0.17
Weighted- Average Exercise Price, Granted		0.55	0.29
Weighted- Average Exercise Price, Exercised	0.25	0.20	0.14
Weighted- Average Exercise Price, Forfeited	0.41	0.40	0.23
Weighted- Average Exercise Price, Expired		0.27	0.24
Weighted- Average Exercise Price, Outstanding, Ending	0.39	$ 0.36	$ 0.24	$ 0.17
Weighted- Average Exercise Price, Vested and exercisable	0.33
Weighted- Average Exercise Price, Vested and expected to vest	$ 0.39
Weighted- Average Remaining Contractual Life (Years), Outstanding	7 years 5 months 19 days	8 years 3 months 7 days	8 years 8 months 23 days	9 years 3 days
Weighted- Average Remaining Contractual Life (Years), Vested and exercisable	7 years 2 months 26 days
Weighted- Average Remaining Contractual Life (Years), Vested and expected to vest	7 years 5 months 19 days
Aggregate Intresic Value,Outstanding, Beginning	$ 140,560	$ 15,707	$ 2,620
Aggregate Intresic Value,Outstanding, Ending	99,406	$ 140,560	$ 15,707	$ 2,620
Aggregate Intresic Value, Vested and exercisable	69,986
Aggregate Intresic Value,Vested and expected to vest	$ 99,406

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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