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Geographic information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segments, Geographical Areas [Abstract]      
Number of operating segments | segment 1    
Segment Reporting Information [Line Items]      
Total assets $ 391,653 $ 269,345  
Property and equipment, net 8,376 7,429  
Revenue 194,392 82,705 $ 36,766
United States      
Segment Reporting Information [Line Items]      
Total assets 278,108 223,098  
Property and equipment, net 6,272 6,439  
Revenue 49,155 1,206  
Non-US      
Segment Reporting Information [Line Items]      
Total assets 113,545 46,247  
Property and equipment, net 2,104 990  
Revenue $ 145,237 $ 81,499