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Stock-based Compensation - Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Options [Roll Forward]
Balance as of December 31, 2020 (in share) | shares	531,336
Granted (in shares) | shares	560,227
Cancelled/forfeited (in shares) | shares	(40,673)
Balance as of September 30, 2021 (in shares) | shares	1,050,890
Vested as of September 30, 2021 (in shares) | shares	293,574
Vested and expected to be vested as of September 30, 2021 (in shares) | shares	974,134
Weighted Average Exercise Price [Roll Forward]
Balance as of December 31, 2020 (in dollars per share) | $ / shares	$ 10.01
Granted (in dollars per share) | $ / shares	2.70
Cancelled/forfeited (in dollars per share) | $ / shares	28.87
Balance as of September 30, 2021 (in dollars per share) | $ / shares	5.38
Vested as of September 30, 2021 (in dollars per share) | $ / shares	12.67
Vested and expected to be vested as of September 30, 2021 (in dollars per share) | $ / shares	$ 5.56
Weighted Average Remaining Contractual Life (years) [Roll Forward]
Balance as of September 31, 2021	9 years 1 month 6 days
Vested as of September 30, 2021	8 years 10 months 24 days
Vested and expected to be vested as of September 30, 2021	9 years 1 month 6 days

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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