Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2015

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

5. Accrued Expenses and Other Current Liabilities

        Accrued expenses consist of the following (in thousands):

	December 31,
	2015		2014
Research costs—Nordic(1)	$	2,898	$	11,536
Research costs—other		5,178		3,336
Payroll and employee benefits		3,330		1,659
Professional fees		3,546		1,304
Accrued interest on notes payable		—		234
Other		—		198
Total accrued expenses and other current liabilties	$	14,952	$	18,267

(1)           Includes amounts accrued ratably over the estimated per patient treatment period under the Nordic Work Statement NB-1 and Work Statement NB-3. Amounts do not include pass-through costs which are expensed as incurred or upon delivery. See note 10 for additional information.