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Accounts payable and accrued expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Employee compensation, benefits, and related accruals $ 11,064 $ 13,649
Consulting and contracted research 11,006 11,505
Professional fees 2,252 1,237
Sales allowance and other costs 23,836 13,245
Accounts payable 6,062 6,298
Other 9,776 2,825
Accounts payable and accrued expenses $ 63,996 $ 48,759