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Accounts payable and accrued expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Employee compensation, benefits, and related accruals $ 8,898 $ 11,187
Consulting and contracted research 13,336 13,753
Professional fees 1,679 2,523
Accounts payable 19,238 11,940
Accrued severance 231 0
Other 4,377 5,844
Accounts payable and accrued expenses $ 47,759 $ 45,247