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Segment Reporting and Significant Customer Information - Long Lives Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets    
Long-lived assets $ 4,528 $ 4,921
United States    
Revenues from External Customers and Long-Lived Assets    
Long-lived assets 3,989 3,893
Rest of the world    
Revenues from External Customers and Long-Lived Assets    
Long-lived assets $ 539 $ 1,028