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Accounts payable and accrued expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Employee compensation, benefits, and related accruals $ 7,605 $ 13,649
Consulting and contracted research 8,827 11,505
Professional fees 2,298 1,237
Sales allowance and other costs 19,088 13,245
Accounts payable 3,579 6,298
Other 3,756 2,825
Accounts payable and accrued expenses $ 45,153 $ 48,759