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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets    
Cash and cash equivalents $ 5,279 $ 2,529
Short-term investments 25,180 30,798
Accounts receivable, net 68 287
Prepaid expenses and other current assets 1,510 1,362
Total current assets 32,037 34,976
Long-term investments 6,849 7,383
Property and equipment, net 1,118 1,238
Goodwill 23,134 23,134
Intangible assets, net 2,404 2,654
Other assets 145 149
Total assets 65,687 69,534
Current liabilities    
Accounts payable 1,645 393
Accrued expenses and other liabilities 2,041 3,947
Deferred revenue 336 481
Total current liabilities 4,022 4,821
Long-term liabilities 185 171
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; 40,464 shares and 40,054 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively 405 401
Additional paid-in capital 159,070 157,143
Accumulated other comprehensive income 15 11
Accumulated deficit (98,010) (93,013)
Total stockholders' equity 61,480 64,542
Total liabilities and stockholders' equity $ 65,687 $ 69,534