REDEEMABLE PREFERRED STOCK - Narrative (Details) - USD ($)		9 Months Ended	15 Months Ended
	Jul. 01, 2016	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Preferred stock redemption, trading days prior to redemption		20 days
Units issued (in shares)		568,921	568,921
Proceeds from issuance of preferred stock and warrants			$ 14,223,000
Costs specifically identifiable to the offering			1,140,000
Non issuance specific costs			3,020,000
Deferred rent receivable reclassified to temporary equity			47,000
Deferred rent receivable reclassified to stockholders' equity			$ 0
Series A Preferred Stock
Class of Stock [Line Items]
Redeemable preferred stock, par value (in usd per share)		$ 0.001	$ 0.001	$ 0.001
Preferred stock, stated value (in usd per share)		$ 25.00	$ 25.00	$ 25.00
Preferred stock redemption, trading days prior to redemption		20 days
Number of shares redeemed		0
Proceeds from issuance of preferred stock			$ 14,129,000
Costs specifically identifiable to the offering			1,106,000
Cumulative dividend rate		5.50%
Dividend per share per quarter (in usd per share)		$ 0.34375
Warrant
Class of Stock [Line Items]
Net proceeds from issuance of warrants			94,000
Costs specifically identifiable to the offering			$ 34,000
Registration Statement
Class of Stock [Line Items]
Maximum amount of offering	$ 900,000,000
Warrant right to purchase a share of Common Stock (in shares)	0.25
Maximum number of units in offering (in shares)	36,000,000
Registration Statement | Series A Preferred Stock
Class of Stock [Line Items]
Redeemable preferred stock, par value (in usd per share)	$ 0.001
Preferred stock, stated value (in usd per share)	$ 25
Preferred Stock, Redemption Period, Year Two | Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, redemption fee	13.00%
Preferred Stock, Redemption Period, After Year Two, Before Year Five | Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, redemption fee	10.00%
Preferred Stock, Redemption Period, After Year Five | Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, redemption fee	0.00%