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Product Warranty (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Minimum [Member]
Mar. 31, 2013
Maximum [Member]
Product Warranty (Textual) [Abstract]        
Limited warranty period on product     1 year 2 years
Accrued product warranty costs $ 803 $ 814