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Stock-Based Compensation - Narrative (Details) - USD ($)	1 Months Ended		12 Months Ended			156 Months Ended	204 Months Ended
	May 31, 2021	May 31, 2014	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2021	May 20, 2020	May 19, 2020	Dec. 31, 2008	Dec. 31, 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares)			0				150,000
Allocated share-based compensation expense			$ 3,441,000	$ 4,991,000	$ 6,152,000
Stock-based compensation expense			3,708,000			$ 3,708,000	$ 3,708,000
Intrinsic value of options exercised			133,000	299,000	2,055,000
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense			2,610,000	3,734,000	$ 4,659,000
Total compensation expense that has yet to be recognized			2,920,000			2,920,000	2,920,000
Intrinsic value of the unvested restricted stock awards outstanding			$ 4,703,000	$ 5,469,000		$ 4,703,000	$ 4,703,000
Employee Stock Award Plan-2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of authorized shares available for future issuance (in shares)			1,317,819	700,680		1,317,819	1,317,819			1,900,000
Additional shares authorized (in shares)	650,000	1,500,000	650,000			2,150,000
Employee Stock Award Plan-2008 \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration term			10 years
Employee Stock Award Plan-2008 \| Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option awards vest and exercisable in installments			20.00%
Employee Stock Award Plan-2008 \| Tranche one \| Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of restricted stock awards			3 years
Employee Stock Award Plan-2008 \| Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option awards vest and exercisable in installments			33.30%
Employee Stock Award Plan-2008 \| Tranche two \| Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of restricted stock awards			5 years
Director Plan - 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of authorized shares available for future issuance (in shares)			144,352	160,135		144,352	144,352	450,000	300,000		300,000