CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss attributable to common stockholders	$ (1,558)	$ (681)
Adjustments to reconcile net loss attributable to common stockholders to net cash used in operating activities:
Depreciation and amortization	129	124
Amortization of deferred finance costs	0	82
Stock-based compensation expense	349	309
Deferred rents receivable	8	(44)
Equity in net loss from unconsolidated joint venture	117	271
Distribution from unconsolidated joint venture	72	62
Decrease (increase) in operating assets:
Receivables, net	106	112
Prepaid expenses and other assets, net	(132)	(186)
Decrease in operating liabilities:
Accounts payable and accrued expenses	(1,787)	(1,258)
Pension liabilities	(204)	(203)
Net cash used in operating activities	(2,900)	(1,412)
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to real estate	(11,110)	(1,725)
Deferred real estate deposits	20,580	0
Investment in unconsolidated joint venture	0	(70)
Net cash provided by (used in) investing activities	9,470	(1,795)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from loans payable	4,915	0
Payment of finance costs	(192)	0
Settlement of stock awards	(541)	(693)
Proceeds from sale of common stock, net	0	26,601
Net cash provided by financing activities	4,182	25,908
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	10,752	22,701
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	24,189	8,366
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	34,941	31,067
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	15,273	4,678
RESTRICTED CASH, BEGINNING OF PERIOD	8,916	3,688
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	24,189	8,366
CASH AND CASH EQUIVALENTS, END OF PERIOD	24,806	26,679
RESTRICTED CASH, END OF PERIOD	10,135	4,388
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	34,941	31,067
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for: Interest	623	564
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued development costs included in accounts payable and accrued expenses	8,502	1,279
Capitalized amortization of deferred financing costs and lease commissions	495	14
Real Estate [Member]
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Capitalized stock-based compensation expense	$ 189	$ 667