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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
Mar. 31, 2021
Mar. 31, 2020
Revenue, Major Customer [Line Items]    
Total revenues $ 14,284 $ 20,327
United States    
Revenue, Major Customer [Line Items]    
Total revenues 9,221 11,515
United Kingdom    
Revenue, Major Customer [Line Items]    
Total revenues 2,120 5,113
Germany    
Revenue, Major Customer [Line Items]    
Total revenues 1,168 2,015
Rest of the world    
Revenue, Major Customer [Line Items]    
Total revenues $ 1,775 $ 1,684