Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 23,598	$ 38,539
Marketable securities	224,177	102,788
Prepaid expenses and other, current	6,888	6,292
Licensor receivable		1,760
Total current assets	254,663	149,379
Property and equipment, net	2,532	2,157
Prepaid expenses and other, long-term	10,117	10,007
Restricted cash	4,312	1,215
Total assets	271,624	162,758
Current liabilities:
Accounts payable	9,783	14,997
Accrued expenses	15,548	29,444
Total current liabilities	25,331	44,441
Deferred rent	1,452	1,269
Total liabilities	26,783	45,710
Stockholders' equity:
Common stock - $.0001 par value; 100,000,000 shares authorized; 32,423,527 shares issued and outstanding at September 30, 2015 and 30,548,309 issued and outstanding at December 31, 2014	3	3
Additional paid-in capital	703,651	399,191
Receivables from the exercises of options		(835)
Accumulated other comprehensive loss	(32)	(95)
Accumulated deficit	(458,781)	(281,216)
Total stockholders' equity	244,841	117,048
Total liabilities and stockholders' equity	$ 271,624	$ 162,758