Stock-based Compensation - Award Status (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Shares
Outstanding at beginning of year (in shares)	39,085
Expired (in shares)	(7,699)
Outstanding at end of year (in shares)	31,386	39,085
Exercisable at end of year (in shares)	31,386
Weighted-Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 23.53
Expired (in dollars per share)	23.53
Outstanding at end of year (in dollars per share)	23.53	$ 23.53
Exercisable at end of year (in dollars per share)	$ 23.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Life, Outstanding	4 years 10 months 17 days	5 years 10 months 17 days
Weighted-Average Remaining Contractual Life, Exercisable	4 years 10 months 17 days
Intrinsic Value, Outstanding at end of year (in dollars)	$ 113
Intrinsic Value, Exercisable at end of year (in dollars)	$ 113

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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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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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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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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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