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Geographic Information - Long Lived Assets By Geographic Area (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 16,389 $ 16,159
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 14,076 15,130
Japan    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 1,614 34
Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 699 $ 995