Accrued Warranty (Details) - Accrued warranty (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Accrued warranty [Abstract]
Balance at beginning of year	$ 665	$ 645
Accrued warranty expense	540	728
Warranty claims paid	(707)	(725)
Translation adjustment	(45)	17
Balance at end of year	$ 453	$ 665