Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (3,695)	$ (1,801)	$ (5,948)	$ (7,533)
Change in fair value of derivative instruments, accounted for as hedges, net of income tax expense (benefit) of $0, ($10), ($106) and $179, respectively	401	(17)	(679)	5,053
Comprehensive loss	$ (3,294)	$ (1,818)	$ (6,627)	$ (2,480)