CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Other Comprehensive Income [Abstract]
Net loss	$ (12,550)	$ (10,069)
Other comprehensive income (loss):
Reduction (increase) in additional minimum pension liability	209	(15)
Foreign currency translation adjustment	27	(106)
Comprehensive loss	$ (12,314)	$ (10,190)