Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2016

Payables and Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

Accrued expenses consist of the following (in thousands):

	December 31,
	2016		2015
Research costs—Nordic (1)	$	1,228	$	2,898
Research costs—other	8,404		5,178
Payroll and employee benefits	9,338		3,330
Professional fees	7,532		3,546
Other current liabilities	95		—
Total accrued expenses and other current liabilities	$	26,597	$	14,952

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(1) Includes amounts accrued ratably over the estimated per patient treatment period for the services provided by Nordic under the Second Extension. Amounts do not include pass-through costs which are expensed as incurred or upon delivery. See Note 10 for additional information.