Accrued Warranty - Summary of Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Accrued Warranty
Balance at beginning of period	$ 338	$ 228
Accrued warranty expense	(16)	387
Warranty claims paid	(152)	(301)
Transferred in sale of DuraFit	(110)	0
Translation adjustment	5	0
Balance at end of period	$ 65	$ 314
Minimum
Accrued Warranty
Warrants period	1 year
Maximum
Accrued Warranty
Warrants period	5 years