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Accounts payable and accrued expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounts payable and accrued expenses    
Employee compensation, benefits, and related accruals $ 11,187 $ 9,312
Consulting and contracted research 13,753 9,349
Professional fees 2,523 3,334
Accounts payable 11,940 4,128
Other 5,844 2,998
Accounts payable and accrued expenses $ 45,247 $ 29,121