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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 $ 2,174 $ 2,529
Short-term investments 33,409 30,798
Accounts receivable, net 54 287
Prepaid expenses and other current assets 1,768 1,362
Total current assets 37,405 34,976
Long-term investments 17,671 7,383
Property and equipment, net 780 1,238
Goodwill 23,134 23,134
Intangible assets, net 1,904 2,654
Other assets 137 149
Total assets 81,031 69,534
Current liabilities    
Accounts payable 195 393
Accrued expenses and other liabilities 1,642 3,947
Deferred revenue 205 481
Total current liabilities 2,042 4,821
Long-term liabilities 208 171
Commitments and contingencies (Note 4)      
Stockholders' equity    
Preferred stock, $0.01 par value; 20,000 shares authorized; none issued and outstanding      
Common stock, $0.01 par value; 120,000 shares authorized; 48,322 shares and 40,054 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively 483 401
Additional paid-in capital 189,657 157,143
Accumulated other comprehensive income (loss) (8) 11
Accumulated deficit (111,351) (93,013)
Total stockholders' equity 78,781 64,542
Total liabilities and stockholders' equity $ 81,031 $ 69,534