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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 10,186 $ 21,679
Marketable securities 82,627 41,868
Interest receivable 338 190
Accounts receivable 3,155 4,129
Prepaid expenses 457 296
Restricted cash 320  
Other current assets 191 203
Total current assets 97,274 68,365
Marketable securities, non-current 38,663 12,584
Property and equipment, net 1,406 1,543
Intangible assets, in-process research and development 1,870  
Goodwill 1,585  
Other assets 40 41
Total assets 140,838 82,533
Current liabilities:    
Accounts payable and accrued liabilities 4,380 4,013
Accrued compensation and employee benefits 3,194 2,473
Escrow liability 275  
Deferred revenue 2,282 2,304
Total current liabilities 10,131 8,790
Deferred revenue, non-current 6,679 8,847
Contingent consideration liability 1,570  
Deferred tax liability 748  
Total liabilities 19,128 17,637
Commitments and contingencies      
Stockholders' equity:    
Common stock, $0.01 par value; 80,000,000 shares authorized, 62,243,892 and 53,058,525 shares issued and outstanding at December 31, 2013 and 2012, respectively 622 531
Additional paid-in capital 423,209 339,848
Accumulated deficit (302,133) (275,509)
Accumulated other comprehensive income 12 26
Total stockholders' equity 121,710 64,896
Total liabilities and stockholders' equity $ 140,838 $ 82,533