CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (4,799)	$ (4,213)
Other comprehensive loss:
Unrealized loss on derivative instruments	(23)	(9)
Other comprehensive loss	(23)	(9)
Comprehensive loss	(4,822)	(4,222)
Comprehensive income attributable to non-controlling interests	(29)	(32)
Comprehensive loss attributable to common stockholders	$ (4,851)	$ (4,254)