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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets    
Cash and cash equivalents $ 8,172 $ 2,529
Short-term investments 31,813 30,798
Accounts receivable, net 81 287
Prepaid expenses and other current assets 1,623 1,362
Total current assets 41,689 34,976
Long-term investments 18,951 7,383
Property and equipment, net 915 1,238
Goodwill 23,134 23,134
Intangible assets, net 2,154 2,654
Other assets 139 149
Total assets 86,982 69,534
Current liabilities    
Accounts payable 445 393
Accrued expenses and other liabilities 2,105 3,947
Deferred revenue 241 481
Total current liabilities 2,791 4,821
Long-term liabilities 197 171
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; 48,039 shares and 40,054 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively 480 401
Additional paid-in capital 187,979 157,143
Accumulated other comprehensive income (loss) (59) 11
Accumulated deficit (104,406) (93,013)
Total stockholders' equity 83,994 64,542
Total liabilities and stockholders' equity $ 86,982 $ 69,534