Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 11,205	$ 10,186
Marketable securities	151,219	82,627
Interest receivable	313	338
Accounts receivable	8,474	3,155
Prepaid expenses	751	457
Restricted cash	320	320
Other current assets	887	191
Total current assets	173,169	97,274
Marketable securities, non-current	69,049	38,663
Property and equipment, net	1,566	1,406
Intangible assets, in-process research and development	1,870	1,870
Goodwill	1,585	1,585
Other assets	108	40
Total assets	247,347	140,838
Current liabilities:
Accounts payable and accrued liabilities	7,999	4,380
Accrued compensation and employee benefits	2,664	3,194
Escrow liability	275	275
Deferred revenues	8,556	2,282
Total current liabilities	19,494	10,131
Deferred revenues, non-current	15,266	6,679
Contingent consideration liability	1,700	1,570
Deferred tax liability	748	748
Total liabilities	37,208	19,128
Commitments and contingencies
Stockholders' equity:
Common stock, $0.01 par value; 160,000,000 and 80,000,000 shares authorized as of September 30, 2014 and December 31, 2013, respectively; 68,333,273 and 62,243,892 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	683	622
Additional paid-in capital	533,634	423,209
Accumulated deficit	(324,231)	(302,133)
Accumulated other comprehensive income	53	12
Total stockholders' equity	210,139	121,710
Total liabilities and stockholders' equity	$ 247,347	$ 140,838