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RELATED PARTY TRANSACTIONS AND COMMITMENTS - Contractual Agreements (Details)					1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 11, 2017 USD ($) shares	Dec. 22, 2016 USD ($)	Jul. 24, 2014 USD ($)	Jul. 22, 2014 USD ($)	Jun. 30, 2011	Jun. 30, 2017 shares	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) Loan shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Jul. 01, 2017 USD ($)
Related Party Transaction [Line Items]
Vesting period								3 years
Syndicated financing of investment								$ 725,000	$ (611,000)
Professional fees								5,226,000	4,364,000
Advances to partnerships								650,000	0
Cash paid for interest								$ 2,174,000	7,806,000
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Percentage of carrying value used to calculate legacy assets performance fee								110.00%
Legacy fees								$ 35,000	700,000
Chief Financial Officer [Member]
Related Party Transaction [Line Items]
Annual compensation	$ 300,000
Percentage of executive bonus pool	11.50%
Guaranteed bonus	$ 50,000
Severance guaranteed, Percent of base salary	50.00%
Juniper Capital Partners Llc [Member]
Related Party Transaction [Line Items]
Consulting agreement initial period					3 years
Consulting agreement renewable terms					P2Y
JCP Realty Advisors, LLC [Member]
Related Party Transaction [Line Items]
Percentage of carrying value used to calculate legacy assets performance fee			110.00%
Legacy fees								1,200,000	100,000
Annual consulting fees			$ 500,000	$ 600,000
Origination Fee			1.25%
Percentage of legacy assets performance fee			5.50%
Consulting fees								500,000	600,000
Unconsolidated Partnerships [Member]
Related Party Transaction [Line Items]
Advances to partnerships								1,500,000
Maximum borrowing capacity									700,000		$ 5,000,000
Notes receivable								$ 1,900,000
Effective rate (percentage)								6.50%
Utah JV [Member]
Related Party Transaction [Line Items]
Syndicated financing of investment								$ 1,700,000	1,700,000
Professional fees								600,000	900,000
Legal and other professional fees payable								0	200,000
Related Parties [Member] \| Utah JV [Member]
Related Party Transaction [Line Items]
Syndicated financing of investment									1,400,000
Related Parties [Member] \| Utah JV [Member] \| Director [Member]
Related Party Transaction [Line Items]
Syndicated financing of investment								1,100,000	1,100,000
Related Parties [Member] \| Utah JV [Member] \| Board of Directors [Member]
Related Party Transaction [Line Items]
Syndicated financing of investment								200,000	200,000
Related Parties [Member] \| Utah JV [Member] \| Law Firm [Member]
Related Party Transaction [Line Items]
Syndicated financing of investment								$ 100,000	$ 100,000
Restricted Stock [Member]
Related Party Transaction [Line Items]
Restricted stock grants \| shares								469,097	86,207
Vesting period								3 years
Restricted Stock [Member] \| Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Restricted stock grants \| shares										850,000
Restricted Stock [Member] \| Chief Financial Officer [Member]
Related Party Transaction [Line Items]
Restricted stock grants \| shares	100,000					100,000		50,000
Vesting period	3 years							3 years
Prime Rate [Member]
Related Party Transaction [Line Items]
Mortgage Loans On Real Estate Interest								4.50%	3.75%
Prime Rate [Member] \| Minimum [Member] \| Unconsolidated Partnerships [Member]
Related Party Transaction [Line Items]
Variable rate (percent)								2.00%
Prime Rate [Member] \| Maximum [Member] \| Unconsolidated Partnerships [Member]
Related Party Transaction [Line Items]
Variable rate (percent)								8.00%
Mortgage Receivable [Member]
Related Party Transaction [Line Items]
Number of loans acquired \| Loan								2
Discount on loans acquired								$ 19,300,000
Mortgage Loans on Real Estate, Pledged Equity Interest, Collateral Percent								100.00%
New loan originations								$ 19,875,000
Number of extensions available for loans acquired								3
Mortgage Loans on Real Estate, New Mortgage Loans, Number of Extensions Exercised								2
Mortgage Receivable [Member] \| Minimum [Member]
Related Party Transaction [Line Items]
Annual interest rate of loans acquired								8.70%	11.00%
Mortgage Receivable [Member] \| Maximum [Member]
Related Party Transaction [Line Items]
Annual interest rate of loans acquired								12.00%	12.00%
Variable Interest Entity [Member] \| Lakeside JV [Member]
Related Party Transaction [Line Items]
Advances to partnerships								$ 700,000
Variable Interest Entity [Member] \| Prime Rate [Member] \| Lakeside JV [Member]
Related Party Transaction [Line Items]
Variable rate (percent)								8.00%
Mezzanine Loan One [Member] \| Mortgage Receivable [Member]
Related Party Transaction [Line Items]
Mortgage Loans On Real Estate Interest								9.75%
Annual interest rate of loans acquired								11.23%
Mezzanine Loan Two [Member] \| Mortgage Receivable [Member]
Related Party Transaction [Line Items]
Number of extensions available for loans acquired								3
Mortgage Loans On Real Estate Interest								7.25%
Annual interest rate of loans acquired								8.73%
Non-Revolving Credit Facility [Member] \| SRE Monarch Lending [Member]
Related Party Transaction [Line Items]
Debt Instrument, Interest Rate, Stated Percentage										16.00%
Unsecured Debt [Member] \| Non-Revolving Credit Facility [Member] \| SRE Monarch Lending [Member]
Related Party Transaction [Line Items]
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases										$ 5,000,000
Interest Expense, Related Party									$ 800,000
Cash paid for interest									400,000
SRE Revolver [Member] \| SRE Monarch Lending [Member]
Related Party Transaction [Line Items]
Proceeds from line of credit									$ 4,000,000
Related Party Transaction, Rate									5.00%
Debt Instrument, Fee Amount									$ 100,000
Payments of debt issuance costs		$ 400,000
Debt Instrument, Amount Due Upon Sale of Collateral, Percent								5.00%
Repayments of debt							$ 200,000