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Segment Reporting and Significant Customer Information - Long Lives Assets by Geographic Area (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets    
Long-Lived Assets $ 10,654 $ 8,649
UNITED STATES
   
Revenues from External Customers and Long-Lived Assets    
Long-Lived Assets 8,672 6,557
Rest of The World [Member]
   
Revenues from External Customers and Long-Lived Assets    
Long-Lived Assets $ 1,982 $ 2,092