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Segment Reporting and Significant Customer Information - Long Lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets    
Long-lived assets $ 1,689 $ 2,861
United States    
Revenues from External Customers and Long-Lived Assets    
Long-lived assets 1,218 2,359
Rest of the world    
Revenues from External Customers and Long-Lived Assets    
Long-lived assets $ 471 $ 502