CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (4,215)	$ (4,273)	$ (9,014)	$ (8,486)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative instruments	1	(15)	(22)	(24)
Other comprehensive income (loss)	1	(15)	(22)	(24)
Comprehensive loss	(4,214)	(4,288)	(9,036)	(8,510)
Comprehensive income attributable to non-controlling interests	(30)	(42)	(59)	(74)
Comprehensive loss attributable to common stockholders	$ (4,244)	$ (4,330)	$ (9,095)	$ (8,584)