Accrued Liabilities

12 Months Ended

Dec. 31, 2012

Accrued Liabilities

Accrued Liabilities

8. Accrued Liabilities

Accrued Liabilities are comprised of the following (and is included within the accounts payable and accrued expenses line item on the consolidated balance sheets), in thousands:

	December 31,
	2011		2012
Accrued Clinical Trial Costs	$	6,501	$	3,335
Accrued Compensation		1,547		2,492
Interest Payable		138		213
Other Accrued Liabilities		1,089		1,820
	$	9,275	$	7,860

Accrued clinical trial costs consist primarily of investigator fees, contract research organization services and laboratory costs. Other accrued expenses consist primarily of marketing, sales and miscellaneous accrued expenses.