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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts payable and accrued expenses    
Accounts payable $ 7,867 $ 12,905
Accrued professional fees 5,845 5,079
Accrued contract manufacturing & contract research costs 4,632 8,042
Accrued compensation and benefits 19,620 9,686
Accrued facility costs 1,665 1,740
Accrued program fees 5,707  
Foreign currency forward contract   265
Capital lease, short term portion 307 283
Royalties payable 2,529 510
Accrued interest 313 208
Accrued other 5,405 2,290
Accounts payable and accrued expenses $ 53,890 $ 41,008