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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue, Major Customer [Line Items]        
Total revenues $ 13,787 $ 23,833 $ 41,118 $ 79,599
United States        
Revenue, Major Customer [Line Items]        
Total revenues 8,345 13,817 23,753 47,041
United Kingdom        
Revenue, Major Customer [Line Items]        
Total revenues 3,095 4,335 10,189 14,930
Germany        
Revenue, Major Customer [Line Items]        
Total revenues 1,386 2,830 4,148 9,262
Rest of the world        
Revenue, Major Customer [Line Items]        
Total revenues $ 961 $ 2,851 $ 3,028 $ 8,366