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Share-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Stock Options Outstanding
Outstanding — beginning of period	813,296	808,579
Granted	82,825	150,500
Exercised	0	(37,069)
Canceled	(350,249)	(108,714)
Outstanding — end of period	545,872	813,296
Vested and Expected to Vest — December 31, 2023	504,839
Exercisable — December 31, 2023	365,246
Weighted-Average Exercise Price Per Option
Outstanding — beginning of period (usd per share)	$ 46.50	$ 48.05
Granted (usd per share)	4.13	46.30
Exercised (usd per share)	0	13.70
Canceled (usd per share)	38.39	79.65
Outstanding — end of period (usd per share)	44.16	$ 46.50
Vested and Expected to Vest (usd per share)	45.74
Exercisable (usd per share)	$ 49.57
Weighted-Average Remaining Contractual Term (Years), Options Outstanding	6 years 3 months 18 days
Weighted-Average Remaining Contractual Term (Years), Options Vested and Expected to Vest	6 years 29 days
Weighted-Average Remaining Contractual Term (Years), Options Exercisable	5 years 25 days
Aggregate Intrinsic Value, Options Outstanding	$ 1
Aggregate Intrinsic Value, Options Vested and Expected to Vest	0
Aggregate Intrinsic Value, Options Exercisable	$ 0

X

- Definition

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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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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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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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