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Geographic information (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Total assets $ 269,345 $ 365,281  
Property and equipment, net 7,429 8,974  
Revenue 82,705 36,766 $ 25,245
United States      
Segment Reporting Information [Line Items]      
Total assets 223,098 340,755  
Property and equipment, net 6,439 8,206  
Revenue 1,206 5,218  
Non-US      
Segment Reporting Information [Line Items]      
Total assets 46,247 24,526  
Property and equipment, net 990 768  
Revenue $ 81,499 $ 31,548