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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 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Revenue, Major Customer [Line Items]                    
Revenues $ 12,483 $ 13,787 $ 7,004 $ 20,327 $ 25,326 $ 23,833 $ 26,606 $ 29,160 $ 53,601 $ 104,925
United States                    
Revenue, Major Customer [Line Items]                    
Revenues                 31,854 61,375
United Kingdom                    
Revenue, Major Customer [Line Items]                    
Revenues                 12,832 19,961
Germany                    
Revenue, Major Customer [Line Items]                    
Revenues                 4,853 12,176
Rest of the world                    
Revenue, Major Customer [Line Items]                    
Revenues                 $ 4,062 $ 11,413