Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Convertible Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance, beginning of period at Dec. 31, 2017	$ 330,660	$ 1	$ 606	$ 534,683	$ (444)	$ (204,186)
Balance, beginning of period (in shares) at Dec. 31, 2017		50,000	60,782,000
Common stock issued through distribution reinvestment plan	20,693		$ 24	20,669
Common stock issued through distribution reinvestment plan (in shares)			2,397,000
Distributions declared	(36,634)					(36,634)
Common stock redemptions	(15,877)		$ (18)	(15,859)
Common stock redemptions (in shares)			(1,800,000)
Designated derivatives, fair value adjustment	65				65
Net loss	(35,441)					(35,441)
Balance, end of period at Dec. 31, 2018	$ 263,466	$ 1	$ 612	539,493	(379)	(276,261)
Balance, end of period (in shares) at Dec. 31, 2018	61,378,367	50,000	61,379,000
Common stock issued through distribution reinvestment plan	$ 14,724		$ 18	14,706
Common stock issued through distribution reinvestment plan (in shares)			1,754,000
Distributions declared	(24,358)					(24,358)
Common stock redemptions	(25,765)		$ (30)	(25,735)
Common stock redemptions (in shares)			(3,038,000)
Designated derivatives, fair value adjustment	190				190
Net loss	(11,944)					(11,944)
Balance, end of period at Dec. 31, 2019	$ 216,313	$ 1	$ 600	$ 528,464	$ (189)	$ (312,563)
Balance, end of period (in shares) at Dec. 31, 2019	60,094,623	50,000	60,095,000