Stock-based Compensation - Summary Of Stock Options Activity Under The Plan (Details) - $ / shares	1 Months Ended	12 Months Ended
Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Number of Options, Beginning Balance	28,889,524	18,395,130	8,370,552
Number of Options, Granted		13,158,430	12,199,200
Number of Options, Exercised	(185,000)	(871,668)	(1,011,873)
Number of Options, Forfeited		(425,001)	(1,158,528)
Number of Options, Expired		(1,367,367)	(4,221)
Number of Options, Ending Balance		28,889,524	18,395,130	8,370,552
Number of Options, Vested and exercisable		17,099,956
Number of Options, Vested and expected to vest		25,023,502
Weighted Average Exercise Price Per Share, Beginning Balance	$ 5.92	$ 3.78	$ 2.66
Weighted Average Exercise Price Per Share, Granted		8.41	4.36
Weighted Average Exercise Price Per Share, Exercised		2.65	2.61
Weighted Average Exercise Price Per Share, Forfeited		1.68	2.82
Weighted Average Exercise Price Per Share, Expired		4.64	2.81
Weighted Average Exercise Price Per Share, Ending Balance		5.92	$ 3.78	$ 2.66
Weighted Average Exercise Price Per Share, Vested and exercisable		5.26
Weighted Average Exercise Price Per Share, Vested and expected to vest		$ 6.22
Weighted Average Remaining Contractual Term (Years)		8 years 9 months 18 days	9 years 2 months 12 days	9 years 2 months 12 days
Weighted Average Remaining Contractual Term (Years) , Vested and exercisable		8 years 7 months 6 days
Weighted Average Remaining Contractual Term (Years) , Vested and expected to vest		8 years 10 months 24 days

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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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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 exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. 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 fully vested and expected to vest options outstanding that can 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 exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. 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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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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