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Segment Reporting and Significant Customer Information - Long Lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets    
Long-lived assets $ 1,152 $ 1,347
United States    
Revenues from External Customers and Long-Lived Assets    
Long-lived assets 778 912
Rest of the world    
Revenues from External Customers and Long-Lived Assets    
Long-lived assets $ 374 $ 435