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Stock-Based Payments - Summary of Company's Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Stock Options, Beginning balance outstanding	113,558
Number of Stock Options, Granted	554,615
Number of Stock Options Forfeited/Cancelled	(26,807)
Number of Stock Options, Exercised	(214)
Number of Stock Options, Ending balance outstanding	641,152	113,558
Number of Stock Options, Exercisable	271,433
Weighted Average Remaining Contractual Life	9 years 2 months 26 days	7 years 9 months
Weighted Average Remaining Contractual Life, Exercisable	8 years 8 months 19 days
Weighted Average Exercise Price, Beginning balance outstanding	$ 159.33
Weighted Average Exercise Price, Granted	15.05
Weighted Average Exercise Price, Forfeited/Cancelled	64.55
Weighted Average Exercise Price, Exercised	10.50
Weighted Average Exercise Price, Ending balance outstanding	38.54	$ 159.33
Weighted Average Exercise Price, Exercisable	$ 66.81
Aggregate Intrinsic Value, Exercised	$ 1

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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 weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or 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 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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