Stock-based Payments and Director Fees - Schedule of Management Fees and Director Fees (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares (in shares)	3,580	4,116	11,550	12,784
Amount of expense recognized	$ 50	$ 35	$ 150	$ 115
Independent director fees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares (in shares)	3,580	4,116	11,550	12,784
Amount of expense recognized	$ 50	$ 35	$ 150	$ 115