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Geographic Information - Long Lived Assets By Geographic Area (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 12,922 $ 7,262
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 7,902 5,525
Japan    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 2,931 1,108
Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 2,089 $ 629