Notes Receivable (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Aug. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total outstanding principal	$ 6,876	$ 11,159
Interest receivable (net prepaid interest)	1,254	947
Provision for interest receivable	(365)	(229)
Total notes and interest receivable	$ 7,765	11,877
Interest rate	7.5
Notes receivable	$ 7,000	11,700
Mortgage Note Maturing on 1/15/2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total outstanding principal	1,800	1,840
Mortgage Note Maturing on 12/7/2028
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total outstanding principal	234	234
Note Receivable Maturing on 3/16/2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total outstanding principal	2,145	2,145
Mortgage Note Maturing on 3/1/2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal amounts	1,647	1,647
Mortgage Note Maturing on 8/19/2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal amounts		5,125
Mortgage Note Maturing on 12/31/2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal amounts	62	62
Line of Credit Maturing on 11/15/2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal amounts		$ 106
Line of Credit Maturing on 11/15/2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal amounts	$ 988
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