CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net loss	$ (10,095)	$ (7,799)	$ (1,975)
Other comprehensive income (loss):
Reclassification of realized gain on real estate securities	(214)	0	0
Unrealized gain (loss) on real estate securities	247	(46)	0
Total other comprehensive income (loss)	33	(46)	0
Total comprehensive loss	(10,062)	(7,845)	(1,975)
Total comprehensive loss attributable to noncontrolling interests	333	218	0
Total comprehensive loss attributable to common stockholders	$ (9,729)	$ (7,627)	$ (1,975)