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Geographic Sales Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue $ 57,909 $ 49,592
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue 39,598 32,292
All other countries    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue $ 18,311 $ 17,300