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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accrued expenses    
Accounts payable $ 12,905 $ 16,477
Accrued professional fees 5,079 3,578
Accrued contract manufacturing & contract research costs 8,042 2,940
Accrued compensation and benefits 9,981 6,201
Accrued facility costs 1,740 1,321
Foreign currency forward contract 265  
Capital lease, short term portion 283  
Accrued other 2,713 1,699
Accounts payable and accrued expenses $ 41,008 $ 32,216