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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 80,309 $ 21,679
Marketable securities 39,913 41,868
Interest receivable 208 190
Accounts receivable 4,880 4,129
Other current assets 149 203
Prepaid expenses 684 296
Total current assets 126,143 68,365
Marketable securities, non-current 12,690 12,584
Property and equipment, net 1,494 1,543
Other assets 39 41
Total assets 140,366 82,533
Current liabilities:    
Accounts payable and accrued liabilities 2,665 4,013
Accrued compensation and employee benefits 2,039 2,473
Deferred revenues 2,300 2,304
Total current liabilities 7,004 8,790
Deferred revenues, non-current 7,221 8,847
Total liabilities 14,225 17,637
Commitments and contingencies      
Stockholders' equity:    
Common stock, $0.01 par value; 80,000,000 shares authorized, 61,420,655 and 53,058,525 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively 614 531
Additional paid-in capital 419,490 339,848
Accumulated deficit (293,989) (275,509)
Accumulated other comprehensive income 26 26
Total stockholders' equity 126,141 64,896
Total liabilities and stockholders' equity $ 140,366 $ 82,533