Accounts Payable, Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2013

Payables And Accruals [Abstract]

Accounts Payable, Accrued Expenses and Other Current Liabilities

NOTE 7. ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

Accounts payable, accrued expenses and other current liabilities consisted of the following:

	December 31,
	2013		2012
Clinical and preclinical trials	$	34,182	$	25,150
Payroll and payroll-related		23,832		13,439
Accrued professional services and other current liabilities		9,379		6,368
Royalties payable		6,377		2,296
Accounts payable		3,290		2,073
Interest payable		1,698		1,698
Total	$	78,758	$	51,024

Accounts payable represents short-term liabilities for which the Company has received and processed a vendor invoice prior to the end of the reporting period. Accrued expenses and other current liabilities represent, among other things, compensation and related benefits to employees, royalties payable to UCLA, cash interest payable related to the Company’s Convertible Notes, estimated amounts due to third party vendors for services rendered prior to the end of the reporting period, and invoices received from third party vendors.