Accrued Expenses and Other Current Liabilities

3 Months Ended

12 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

3. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consist of the following (in thousands):

	March 31, 2014		December 31, 2013
Research costs — Nordic(1)	$	13,813	$	17,998
Research costs — other		1,558		1,599
Payroll and employee benefits		1,223		1,005
Professional fees		1,533		426
Vacation		75		69
Interest on notes payable		880		852
Other		49		58
Total accrued expenses and other current liabilties	$	19,131	$	22,007

(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 7 for additional information.

7. Accrued Expenses and Other Current Liabilities

Accrued expenses consist of the following (in thousands):

	December 31,
	2013		2012
Research costs-Nordic(1)	$	17,998	$	5,414
Research costs-other		1,599		1,144
Payroll and employee benefits		1,005		962
Professional fees		426		399
Vacation		69		129
Accrued interest on notes payable		852		595
Other		58		97
Total accrued expenses and other current liabilties	$	22,007	$	8,740

(1)

Includes amounts accrued ratably over the estimated per patient treatment period under the Nordic Work Statement NB-1, Work Statement NB-2 and Work Statement NB-3. Amounts do not include pass-through costs which are expensed as incurred or upon delivery. See note 13 for additional information.