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Geographic information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Revenues from External Customers and Long-Lived Assets      
Number of Operating Segments | item 1    
Total assets $ 368,041 $ 333,219  
Property and equipment, net 8,974 9,159  
Revenue, Net 36,766 25,245 $ 34,696
Operating segments      
Revenues from External Customers and Long-Lived Assets      
Total assets 368,041 333,219  
Property and equipment, net 8,974 9,159  
Revenue, Net 36,766 25,245  
US      
Revenues from External Customers and Long-Lived Assets      
Total assets 343,515 330,663  
Property and equipment, net 8,206 8,555  
Revenue, Net 5,218 25,245  
Non US      
Revenues from External Customers and Long-Lived Assets      
Total assets 24,526 2,556  
Property and equipment, net 768 $ 604  
Revenue, Net $ 31,548