Notes Receivable (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) property	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit loss expense	$ 50	$ 50
Total outstanding principal	4,179		$ 4,614
Interest receivable (net prepaid interest)	556		565
Provision for interest receivable	(457)		(412)
Total notes and interest receivable	4,278		4,767
Notes receivable	4,200		4,600
Mortgage Note Maturing on 1/15/2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total outstanding principal	1,806		1,804
Mortgage Note Maturing on 12/7/2028
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total outstanding principal	$ 228		234
Mortgage Note Maturing on 12/7/2028 | Colorado
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of additional properties | property	2
Mortgage Note Maturing on 3/16/2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total outstanding principal	$ 2,145		2,145
Mortgage Note Maturing on 3/16/2022 | Colorado
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of additional properties | property	2
Mortgage Note Maturing on 3/1/2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total outstanding principal			62
Line of Credit Maturing on 3/1/2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total outstanding principal			369
FPI Loan Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Expected credit losses	$ 0		$ 0
FPI Loan Program | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal amounts				$ 100
FPI Loan Program | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, term	6 years