Stock-Based Compensation Plan - Option Activity Under Plan (Details) shares in Thousands	6 Months Ended
Jun. 30, 2022 $ / shares shares
Stock-Based Compensation Plan
Outstanding \| shares	486
Granted \| shares	192
Forfeited \| shares	(2)
Expired \| shares	(18)
Outstanding \| shares	658
Vested and expected to vest \| shares	622
Exercisable \| shares	257
Weighted-Average Exercise Price, Outstanding \| $ / shares	$ 14.58
Weighted-Average Exercise Price, Granted \| $ / shares	3.71
Weighted-Average Exercise Price, Forfeited \| $ / shares	7.02
Weighted-Average Exercise Price, Expired \| $ / shares	5.96
Weighted-Average Exercise Price, Outstanding \| $ / shares	11.67
Weighted - Average Exercise Price, Vested and expected to vest \| $ / shares	12.02
Weighted-Average Exercise Price, Exercisable \| $ / shares	$ 21.70

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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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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 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 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 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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