Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Total Stockholders’ Equity	Common Stock	Preferred Stock	Additional Paid-in Capital	Distributions in Excess of Earnings	Non-controlling Interests	Common Stock	Common Stock Total Stockholders’ Equity	Common Stock Common Stock	Common Stock Additional Paid-in Capital	Series A Preferred Stock	Series A Preferred Stock Total Stockholders’ Equity	Series A Preferred Stock Preferred Stock	Series A Preferred Stock Additional Paid-in Capital	Series A Preferred Stock Distributions in Excess of Earnings	Series D Preferred Stock	Series D Preferred Stock Total Stockholders’ Equity	Series D Preferred Stock Preferred Stock	Series D Preferred Stock Additional Paid-in Capital	Series D Preferred Stock Distributions in Excess of Earnings
Beginning balance (in shares) at Dec. 31, 2019			14,602,149	8,224,254										2,837,094					0
Beginning balance at Dec. 31, 2019	$ 278,195	$ 277,690	$ 15	$ 223,467	$ 794,825	$ (740,617)	$ 505							$ 70,633					$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	56	56			56
Issuance of Stock (in shares)																			5,980
Issuance of Stock																	$ 145	$ 145	$ 150	$ (5)
Common dividends	(1,095)	(1,095)				(1,095)
Issuance of Series A Preferred Warrants	28	28			28
Dividends to holders of Preferred Stock												$ (3,252)	$ (3,252)			$ (3,252)	(3)	(3)			$ (3)
Reclassification of Series A Preferred Stock to permanent equity (in shares)														304,274
Reclassification of Series A Preferred Stock to permanent equity												6,948	6,948	$ 7,588	$ (640)
Redeemable Preferred Stock deemed dividends	(161)	(161)				(161)
Redemption of Series A Preferred Stock (in shares)														(2,452)
Redemption of Series A Preferred Stock												(66)	(66)	$ (61)	5	(10)
Net (loss) income	(1,256)	(1,260)				(1,260)	4
Ending balance (in shares) at Mar. 31, 2020			14,602,149	8,532,056										3,138,916					5,980
Ending balance at Mar. 31, 2020	279,539	279,030	$ 15	$ 231,144	794,269	(746,398)	509							$ 78,160					$ 150
Beginning balance (in shares) at Dec. 31, 2019			14,602,149	8,224,254										2,837,094					0
Beginning balance at Dec. 31, 2019	278,195	277,690	$ 15	$ 223,467	794,825	(740,617)	505							$ 70,633					$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of Series A Preferred Stock to permanent equity	27,434
Net (loss) income	(10,627)
Ending balance (in shares) at Sep. 30, 2020			14,827,410	9,446,326										4,040,429					18,737
Ending balance at Sep. 30, 2020	286,719	286,260	$ 15	$ 253,683	794,807	(762,245)	459							$ 100,386					$ 463
Beginning balance (in shares) at Mar. 31, 2020			14,602,149	8,532,056										3,138,916					5,980
Beginning balance at Mar. 31, 2020	279,539	279,030	$ 15	$ 231,144	794,269	(746,398)	509							$ 78,160					$ 150
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions to noncontrolling interests	(45)						(45)
Stock-based compensation expense (in shares)			21,912
Stock-based compensation expense	56	56			56
Issuance of Stock (in shares)										203,349									920
Issuance of Stock								$ 2,359	$ 2,359		$ 2,359						22	22	$ 23	(1)
Common dividends	(1,112)	(1,112)				(1,112)
Dividends to holders of Preferred Stock												(1,886)	(1,886)			(1,886)	(3)	(3)			(3)
Reclassification of Series A Preferred Stock to permanent equity (in shares)														427,064
Reclassification of Series A Preferred Stock to permanent equity												9,739	9,739	$ 10,638	(899)
Redeemable Preferred Stock deemed dividends	(52)	(52)				(52)
Redemption of Series A Preferred Stock (in shares)														(5,532)
Redemption of Series A Preferred Stock												(183)	(183)	$ (138)	11	(56)
Net (loss) income	(4,041)	(4,043)				(4,043)	2
Ending balance (in shares) at Jun. 30, 2020			14,827,410	8,954,508										3,560,448					6,900
Ending balance at Jun. 30, 2020	284,393	283,927	$ 15	$ 241,667	795,795	(753,550)	466							$ 88,660					$ 173
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	55	55			55
Issuance of Stock (in shares)																			11,837
Issuance of Stock																	280	280	$ 290	(10)
Common dividends	(1,112)	(1,112)				(1,112)
Dividends to holders of Preferred Stock												(2,162)	(2,162)			(2,162)	(10)	(10)			(10)
Reclassification of Series A Preferred Stock to permanent equity (in shares)														482,374
Reclassification of Series A Preferred Stock to permanent equity												10,747	10,747	$ 11,786	(1,039)
Redeemable Preferred Stock deemed dividends	(87)	(87)				(87)
Redemption of Series A Preferred Stock (in shares)														(2,393)
Redemption of Series A Preferred Stock												(55)	(55)	$ (60)	6	(1)
Net (loss) income	(5,330)	(5,323)				(5,323)	(7)
Ending balance (in shares) at Sep. 30, 2020			14,827,410	9,446,326										4,040,429					18,737
Ending balance at Sep. 30, 2020	286,719	286,260	$ 15	$ 253,683	794,807	(762,245)	459							$ 100,386					$ 463
Beginning balance (in shares) at Dec. 31, 2020			14,827,410	9,784,067										4,377,762					19,145
Beginning balance at Dec. 31, 2020	278,114	277,659	$ 15	$ 262,036	794,127	(778,519)	455							$ 108,729					$ 473
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions to noncontrolling interests	(114)						(114)
Stock-based compensation expense	60	60			60
Issuance of Stock (in shares)																			4,045
Issuance of Stock																	96	96	$ 99	(3)
Common dividends	(1,112)	(1,112)				(1,112)
Dividends to holders of Preferred Stock												(2,350)	(2,350)			(2,350)	(9)	(9)			(9)
Reclassification of Series A Preferred Stock to permanent equity (in shares)														366,991
Reclassification of Series A Preferred Stock to permanent equity												8,243	8,243	$ 9,144	(901)
Redeemable Preferred Stock deemed dividends	(57)	(57)				(57)
Redemption of Series A Preferred Stock (in shares)														(29,462)
Redemption of Series A Preferred Stock												(685)	(685)	$ (733)	61	(13)
Net (loss) income	(3,671)	(3,670)				(3,670)	(1)
Ending balance (in shares) at Mar. 31, 2021			14,827,410	10,125,641										4,715,291					23,190
Ending balance at Mar. 31, 2021	278,515	278,175	$ 15	$ 270,546	793,344	(785,730)	340							$ 117,140					$ 572
Beginning balance (in shares) at Dec. 31, 2020			14,827,410	9,784,067										4,377,762					19,145
Beginning balance at Dec. 31, 2020	278,114	277,659	$ 15	$ 262,036	794,127	(778,519)	455							$ 108,729					$ 473
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of Series A Preferred Stock to permanent equity	34,552
Rights Offering costs	(2,000)
Net (loss) income	(1,520)
Ending balance (in shares) at Sep. 30, 2021			23,369,331	11,265,130										5,821,113					56,857
Ending balance at Sep. 30, 2021	375,505	375,163	$ 24	$ 299,323	867,636	(791,820)	342							$ 145,093					$ 1,396
Beginning balance (in shares) at Mar. 31, 2021			14,827,410	10,125,641										4,715,291					23,190
Beginning balance at Mar. 31, 2021	278,515	278,175	$ 15	$ 270,546	793,344	(785,730)	340							$ 117,140					$ 572
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense (in shares)			20,332
Stock-based compensation expense	50	50			50
Issuance of Stock (in shares)										8,521,589									7,835
Issuance of Stock								$ 76,943	$ 76,943	$ 9	$ 76,934						185	185	$ 192	(7)
Common dividends	(1,114)	(1,114)				(1,114)
Dividends to holders of Preferred Stock												(2,511)	(2,511)			(2,511)	(13)	(13)			(13)
Reclassification of Series A Preferred Stock to permanent equity (in shares)														556,587
Reclassification of Series A Preferred Stock to permanent equity												12,481	12,481	$ 13,915	(1,434)
Redeemable Preferred Stock deemed dividends	(106)	(106)				(106)
Redemption of Series A Preferred Stock (in shares)														(18,501)
Redemption of Series A Preferred Stock												(431)	(431)	$ (460)	42	(13)
Net (loss) income	527	530				530	(3)
Ending balance (in shares) at Jun. 30, 2021			23,369,331	10,671,562										5,253,377					31,025
Ending balance at Jun. 30, 2021	364,526	364,189	$ 24	$ 284,193	868,929	(788,957)	337							$ 130,595					$ 764
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributions to noncontrolling interests	9						9
Distributions to noncontrolling interests	(4)						(4)
Stock-based compensation expense	55	55			55
Issuance of Stock (in shares)																			25,832
Issuance of Stock																	612	612	$ 632	$ (20)
Common dividends	(1,753)	(1,753)				(1,753)
Dividends to holders of Preferred Stock												(2,597)	(2,597)			(2,597)	$ (20)	$ (20)			$ (20)
Reclassification of Series A Preferred Stock to permanent equity (in shares)														593,300
Reclassification of Series A Preferred Stock to permanent equity												13,828	13,828	$ 15,132	(1,304)
Redeemable Preferred Stock deemed dividends	(90)	(90)				(90)
Redemption of Series A Preferred Stock (in shares)														(25,564)
Redemption of Series A Preferred Stock												$ (607)	$ (607)	$ (634)	$ 54	$ (27)
Rights Offering costs	(78)	(78)			(78)
Net (loss) income	1,624	1,624				1,624
Ending balance (in shares) at Sep. 30, 2021			23,369,331	11,265,130										5,821,113					56,857
Ending balance at Sep. 30, 2021	$ 375,505	$ 375,163	$ 24	$ 299,323	$ 867,636	$ (791,820)	$ 342							$ 145,093					$ 1,396