Segment Reporting - Summary Information for Reportable Segments (Detail)		3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) segment	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information Line Items
Number of reportable segments | segment	4			4
Assets by Reportable Segment
Total assets	$ 1,111,490,000	$ 1,111,490,000		$ 1,111,490,000		$ 1,068,327,000
Revenues:
Real estate revenue		21,519,000	$ 19,253,000	64,824,000	$ 53,280,000
Resident fees and services		18,948,000	11,865,000	51,863,000	34,053,000
Grant income		864,000	0	864,000	0
Total revenues and grant income		41,331,000	31,118,000	117,551,000	87,333,000
Expenses:
Rental expenses		5,905,000	4,929,000	17,723,000	14,238,000
Property operating expenses		17,397,000	9,884,000	44,856,000	28,194,000
Segment net operating income		18,029,000	16,305,000	54,972,000	44,901,000
Operating Expenses
General and administrative		3,672,000	3,982,000	11,960,000	11,413,000
Acquisition related expenses		57,000	74,000	74,000	1,492,000
Depreciation and amortization		12,669,000	9,552,000	37,919,000	35,561,000
Other income (expense):
Interest expense (including amortization of deferred financing costs and debt discount/premium)		(4,839,000)	(4,140,000)	(15,123,000)	(11,532,000)
Gain (loss) in fair value of derivative financial instruments		1,450,000	(402,000)	(2,302,000)	(5,401,000)
Impairment of real estate investments		(3,064,000)	0	(3,064,000)	0
(Loss) income from unconsolidated entity		(377,000)	(79,000)	952,000	185,000
Other income		8,000	13,000	278,000	162,000
Loss before income taxes		(5,191,000)	(1,911,000)	(14,240,000)	(20,151,000)
Income tax benefit (expense)		39,000	(7,000)	0	(17,000)
Net loss		(5,152,000)	(1,918,000)	(14,240,000)	(20,168,000)
Medical Office Building
Assets by Reportable Segment
Total assets	590,075,000	590,075,000		590,075,000		600,048,000
Revenues:
Real estate revenue		16,338,000	14,144,000	49,184,000	38,802,000
Total revenues and grant income		16,338,000	14,144,000	49,184,000	38,802,000
Expenses:
Rental expenses		5,607,000	4,581,000	16,616,000	12,814,000
Segment net operating income		10,731,000	9,563,000	32,568,000	25,988,000
Senior Housing-RIDEA
Assets by Reportable Segment
Total assets	247,972,000	247,972,000		247,972,000		149,055,000
Revenues:
Resident fees and services		18,948,000	11,865,000	51,863,000	34,053,000
Grant income		864,000		864,000
Total revenues and grant income		19,812,000	11,865,000	52,727,000	34,053,000
Expenses:
Property operating expenses		17,397,000	9,884,000	44,856,000	28,194,000
Segment net operating income		2,415,000	1,981,000	7,871,000	5,859,000
Skilled Nursing Facilities
Assets by Reportable Segment
Total assets	120,219,000	120,219,000		120,219,000		121,749,000
Revenues:
Real estate revenue		2,979,000	2,929,000	8,984,000	8,732,000
Total revenues and grant income		2,979,000	2,929,000	8,984,000	8,732,000
Expenses:
Rental expenses		125,000	135,000	459,000	435,000
Segment net operating income		2,854,000	2,794,000	8,525,000	8,297,000
Senior Housing
Assets by Reportable Segment
Total assets	101,225,000	101,225,000		101,225,000		142,982,000
Revenues:
Real estate revenue		2,202,000	2,180,000	6,656,000	5,746,000
Total revenues and grant income		2,202,000	2,180,000	6,656,000	5,746,000
Expenses:
Rental expenses		173,000	213,000	648,000	989,000
Segment net operating income		2,029,000	$ 1,967,000	6,008,000	$ 4,757,000
Other
Assets by Reportable Segment
Total assets	$ 51,999,000	$ 51,999,000		$ 51,999,000		$ 54,493,000