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Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	8 years 9 months	8 years 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	7 years 5 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	7 years 5 months
Payment, Tax Withholding, Share-based Payment Arrangement	$ 39	$ 112	$ 296
Employee
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	2,901
Share-based Payment Arrangement, Expense	875	876	2,019
Share-based Payment Arrangement, Expense, after Tax	691	692	1,595
Director
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	90
Share-based Payment Arrangement, Expense	310	506	988
Share-based Payment Arrangement, Expense, after Tax	$ 245	$ 400	$ 781

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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