Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 21, 2017 $ / shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2020 USD ($) vote $ / shares shares	Jun. 30, 2019 USD ($) shares	Dec. 31, 2019 $ / shares shares
Equity [Abstract]
Common stock, shares authorized (in shares) | shares		750,000,000		750,000,000		750,000,000
Common stock, par value (in dollars per share)		$ 0.001		$ 0.001		$ 0.001
Preferred stock, shares authorized (in shares) | shares		200,000,000		200,000,000		200,000,000
Preferred stock, par value (in dollars per share)		$ 0.001		$ 0.001		$ 0.001
Number or votes per share | vote				1
Class of Stock [Line Items]
Preferred stock, shares issued (in shares) | shares		1,000		1,000		1,000
Stock-based compensation expense | $			$ 38	$ 19	$ 38
Common stock, par value (in dollars per share)		$ 0.001		$ 0.001		$ 0.001
XIX Merger Agreement
Equity [Abstract]
Common stock, par value (in dollars per share)	$ 0.01
Class of Stock [Line Items]
Conversion of stock, conversion ratio	9,171.98
Common stock, par value (in dollars per share)	$ 0.01
HIREIT Merger
Class of Stock [Line Items]
Conversion of stock, conversion ratio	0.752222
HIREIT Merger | Common Stock
Class of Stock [Line Items]
Conversion of stock, conversion ratio	0.863235
HIREIT Merger | Subordinated Common Stock
Class of Stock [Line Items]
Conversion of stock, conversion ratio	0.752222
Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares) | shares		1,000		1,000		1,000
Share price (in dollars per share)		$ 10.00		$ 10.00		$ 10.00
Conversion terms, cumulative annual return on issue price, percentage				6.00%
Conversion terms, performance threshold				6.00%
Conversion terms, percentage of excess enterprise value				15.00%
8% Cumulative Preferred Stock | XIX Merger Agreement
Class of Stock [Line Items]
Conversion of stock, conversion ratio	1.238477
Preferred stock, dividend rate	8.00%
9% Cumulative Preferred Stock | XIX Merger Agreement
Class of Stock [Line Items]
Conversion of stock, conversion ratio	1.238477
Preferred stock, dividend rate	9.00%
Restricted common stock
Class of Stock [Line Items]
Grants in period (shares) | shares		1,500	3,000	1,500	3,000
Stock-based compensation expense | $		$ 19