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Accounts payable and accrued expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounts payable and accrued expenses    
Employee compensation, benefits, and related accruals $ 7,744 $ 9,312
Consulting and contracted research 9,089 9,349
Professional fees 2,975 3,334
Accounts payable 8,715 4,128
Other 3,172 2,998
Accounts payable and accrued expenses $ 31,695 $ 29,121