Stock-Based Compensation - Summary of Stock Option Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Stock Options, Outstanding balance	1,947,123	77,604
Number of Stock Options, Granted	1,741,159	1,899,507
Number of Stock Options, Exercised	(8,834)	(16,666)
Number of Stock Options, Forfeited	(652,984)	(13,322)
Number of Stock Options, Outstanding balance	3,026,464	1,947,123	77,604
Number of Stock Options, Exercisable	872,570
Number of Stock Options, Options expected to vest	2,153,894
Weighted-Average Exercise Price, Outstanding balance	$ 5.70	$ 114.11
Weighted-Average Exercise Price, Granted	15.93	2.02
Weighted-Average Exercise Price, Exercised	(1.23)	(1.23)
Weighted-Average Exercise Price, Forfeited	(9.18)	(119.38)
Weighted-Average Exercise Price, Outstanding balance	10.84	$ 5.70	$ 114.11
Weighted-Average Exercise Price, Exercisable	9.82
Weighted-Average Exercise Price, Options expected to vest	$ 11.25
Weighted-Average Remaining Contractual Term, Outstanding balance	8 years 6 months 3 days	9 years 6 months 21 days	8 years 1 month 13 days
Weighted-Average Remaining Contractual Term, Exercisable	7 years 5 months 8 days
Weighted-Average Remaining Contractual Term, Options expected to vest	9 years 14 days
Aggregate Intrinsic Value, Outstanding	$ 6,403	$ 10,284
Aggregate Intrinsic Value, Exercisable	3,352
Aggregate Intrinsic Value, Options expected to vest	$ 3,051

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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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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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Amount by which current fair value of underlying stock exceeds exercise price of 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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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 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 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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