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Stock Option Plan - Stock Option Activity (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, December 31, 2021 (in shares)	2,014,330
Forfeited (in shares)	(8,396)
Expired (in shares)	(3,895)
Outstanding, March 31, 2022 (in shares)	2,002,039	2,014,330
Vested and expected to vest, March 31, 2022 (in shares)	2,002,039
Options exercisable, March 31, 2022 (in shares)	1,188,164
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, December 31, 2021, Weighted Average Exercise Price (in dollars per share)	$ 12.10
Forfeited, Weighted Average Exercise Price (in dollars per share)	14.08
Expired, Weighted Average Exercise Price (in dollars per share)	14.30
Outstanding, March 31, 2022, Weighted Average Exercise Price (in dollars per share)	12.08	$ 12.10
Vested and expected to vest, March 31, 2022 (in shares), Weighted Average Exercise Price (in dollars per share)	12.08
Options exercised, March 31, 2022 (in shares), Weighted Average Exercise Price (in dollars per share)	$ 10.47
Stock Options, Additional Disclosures [Abstract]
Outstanding, Weighted Average Remaining Contractual Term	7 years 7 months 17 days	7 years 10 months 13 days
Vested and expected to vest, Weighted Average Remaining Contractual Term	7 years 7 months 17 days
Options exercisable, Weighted Average Remaining Contractual Term	7 years 4 months 6 days
Outstanding, Aggregate Intrinsic Value	$ 3,661	$ 5,428
Vested and expected to vest, Aggregate Intrinsic Value	3,661
Options exercisable, Aggregate Intrinsic Value	$ 3,124

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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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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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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 exercisable or convertible options. 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 exercisable options that may 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 exercisable or convertible options. 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 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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