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Accounts payable and accrued expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Accounts payable and accrued expenses    
Employee compensation, benefits, and related accruals $ 3,416 $ 11,187
Consulting and contracted research 14,033 13,753
Professional fees 3,169 2,523
Accounts payable 16,023 11,940
Accrued severance 1,909  
Other 4,943 5,844
Accounts payable and accrued expenses $ 43,493 $ 45,247