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Stock-Based Compensation - Non-Vested Stock Options (Details) - USD ($)	6 Months Ended	9 Months Ended
	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Share-based Payment Arrangement, Option, Exercise Price Range
Granted shares		1,054,707
Less: Forfeited shares		48,995
Outstanding shares		1,147,215	144,006
Vested Shares		120,638
Exercisable shares		61,232
Granted (Weighted-Average Exercise)		$ 3.86
Less: Forfeited (Weighted-Average Exercise)		8.08
Less: Exercised, (Weighted Average Exercise Price)		0
Outstanding (Weight-Average Exercise)		4.80	$ 13.00
Vested (Weighted-Average Exercise)		15.31
Exercisable (Weighted-Average Exercise)		$ 15.27
Outstanding Options, weighted average remaining contractual term	8 years 9 months	9 years 9 months
Vested weighted average remaining contractual term		7 years 9 months
Exercisable weighted average remaining contractual term		7 years 9 months
Granted Options, Intrinsic Value
Forfeited Options, Intrinsic Value
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price		$ 16.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period		2,503
Exercised Options, Intrinsic Value
Outstanding Options, Intrinsic Value		153	$ 0
Vested Options, Intrinsic value		0
Exercisable Options, Intrinsic Value		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		6 years

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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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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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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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Weighted average price of options that were either forfeited or expired.

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The combined weighted average of the accumulated differences between the fair values on underlying shares and exercises prices to acquire such shares as of the grant date on options that were either forfeited or lapsed.

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The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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 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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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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 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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