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Geographic information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Total assets $ 2,208,278 $ 1,623,782  
Property and equipment, net 33,831 21,549  
Revenue 380,766 306,980 $ 264,734
United States      
Segment Reporting Information [Line Items]      
Total assets 2,073,404 1,508,055  
Property and equipment, net 32,352 19,656  
Revenue 186,396 116,676  
Non-US      
Segment Reporting Information [Line Items]      
Total assets 134,874 115,727  
Property and equipment, net 1,479 1,893  
Revenue $ 194,370 $ 190,304