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Segment Information and Foreign Operations, Revenue by product (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Information and Foreign Operations [Abstract]        
Revenue $ 23,138 $ 20,521 $ 63,932 $ 66,732