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Accounts payable and accrued expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accounts payable and accrued expenses    
Employee compensation, benefits, and related accruals $ 4,688 $ 11,187
Consulting and contracted research 12,846 13,753
Professional fees 1,638 2,523
Accounts payable 16,800 11,940
Accrued severance 995  
Other 5,216 5,844
Accounts payable and accrued expenses $ 42,183 $ 45,247