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Segment Reporting and Significant Customer Information - Long Lives Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets    
Long-lived assets $ 8,468 $ 9,185
United States    
Revenues from External Customers and Long-Lived Assets    
Long-lived assets 6,728 7,646
Rest of the world    
Revenues from External Customers and Long-Lived Assets    
Long-lived assets $ 1,740 $ 1,539