Share-Based Compensation - Compensation Awards (Details) - 2013 EIP and 2014 NEEIP - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Number of Shares Subject To Outstanding Options
Balance at the beginning of the year	2,871,568
Granted ( in shares)	753,400
Forfeited (in shares)	(1,213,075)
Balance at the end of the year	2,411,893	2,871,568
Weighted-Average Exercise Price of Outstanding Options
Balance at the beginning of the year (in dollars per share)	$ 24.62
Granted (in dollars per share)	10.19
Forfeited (in dollars per share)	25.69
Balance at the end of the year (in dollars per share)	$ 19.53	$ 24.62
Additional disclosures
Weighted-Average Remaining Contractual Term (Years), Outstanding	5 years 2 months 26 days
Weighted-Average Remaining Contractual Term (Years), Exercisable	3 years 8 months 8 days
Weighted-Average Remaining Contractual Term (Years), Vested and expected to vest	5 years 2 months 26 days
Aggregate intrinsic value of options outstanding	$ 775
Aggregate intrinsic value of options exercisable	$ 142
Weighted-average estimated fair value (in dollars per share)	$ 5.33	$ 9.25	$ 11.03
Aggregate intrinsic value of vested or expected to vest	$ 775
Total intrinsic value of options exercised		$ 1	$ 384

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

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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 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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