Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss		$ (2,022)	$ (2,422)
Other comprehensive income, net of tax:
Foreign currency translation adjustment		24	888
Unrealized gain on cash flow hedges, net of tax expense of $0 and $0		738	1
Reclassification of pension liability adjustments to earnings, net of tax expense of $0 and $0	[1]	114	109
Other comprehensive income		876	998
Comprehensive loss		$ (1,146)	$ (1,424)

[1] Reclassifications out of accumulated other comprehensive loss for pension obligations are charged to selling and administrative expense.