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Product Warranty (Details Textual) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Minimum
Jun. 30, 2014
Maximum
Product Warranty (Textual) [Abstract]        
Limited warranty period on product     1 year 2 years
Accrued product warranty costs $ 1,616 $ 1,269