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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 99,270 $ 10,186
Marketable securities 94,386 82,627
Interest receivable 311 338
Accounts receivable 6,969 3,155
Prepaid expenses 1,053 457
Restricted cash 320 320
Other current assets 671 191
Total current assets 202,980 97,274
Marketable securities, non-current 42,741 38,663
Property and equipment, net 1,622 1,406
Intangible assets, in-process research and development 1,870 1,870
Goodwill 1,585 1,585
Other assets 39 40
Total assets 250,837 140,838
Current liabilities:    
Accounts payable and accrued liabilities 5,709 4,380
Accrued compensation and employee benefits 1,973 3,194
Escrow liability 275 275
Deferred revenues 8,842 2,282
Total current liabilities 16,799 10,131
Deferred revenues, non-current 17,283 6,679
Contingent consideration liability 1,650 1,570
Deferred tax liability 748 748
Total liabilities 36,480 19,128
Commitments and contingencies      
Stockholders' equity:    
Common stock, $0.01 par value; 160,000,000 and 80,000,000 shares authorized as of June 30, 2014 and December 31, 2013, respectively; 68,101,479 and 62,243,892 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively 681 622
Additional paid-in capital 530,329 423,209
Accumulated deficit (316,686) (302,133)
Accumulated other comprehensive income 33 12
Total stockholders' equity 214,357 121,710
Total liabilities and stockholders' equity $ 250,837 $ 140,838