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Segment Reporting and Significant Customer Information - Long Lives Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 1,347 $ 2,861
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 912 2,359
Rest of the world    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 435 $ 502