Accrued Warranty - Summary of Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 125	$ 338
Accrued warranty expense/(benefit)	(13)	(16)
Transfer in sale of DuraFit business	0	(110)
Warranty claims paid	(35)	(152)
Translation adjustment	(1)	5
Balance at end of period	$ 76	$ 65
Minimum
Product Warranty Liability [Line Items]
Warrants period	1 year
Maximum
Product Warranty Liability [Line Items]
Warrants period	5 years