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Segment Reporting and Significant Customer Information - Revenue for Individual Countries that Exceed 10% of Total Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue, Major Customer [Line Items]        
Total revenues $ 7,004 $ 26,606 $ 27,331 $ 55,766
United States        
Revenue, Major Customer [Line Items]        
Total revenues 3,893 16,329 15,408 33,224
United Kingdom        
Revenue, Major Customer [Line Items]        
Total revenues 1,981 4,736 7,094 10,595
Germany        
Revenue, Major Customer [Line Items]        
Total revenues 747 2,791 2,762 6,432
Rest of the world        
Revenue, Major Customer [Line Items]        
Total revenues $ 383 $ 2,750 $ 2,067 $ 5,515