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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current assets    
Cash and cash equivalents $ 2,529 $ 40,025
Short-term investments 30,798 9,413
Accounts receivable, net 287 969
Prepaid expenses and other current assets 1,362 1,596
Total current assets 34,976 52,003
Long-term investments 7,383 8,537
Property and equipment, net 1,238 1,382
Goodwill 23,134 23,134
Intangible assets, net 2,654 4,400
Other assets 149 181
Total assets 69,534 89,637
Current liabilities    
Accounts payable 393 336
Accrued expenses and other liabilities 3,947 2,779
Deferred revenue 481 920
Total current liabilities 4,821 4,035
Long-term liabilities 171 109
Commitments and contingencies (Note 12)      
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; 40,054 shares and 38,423 shares issued and outstanding at December 31, 2012 and 2011, respectively 401 384
Additional paid-in capital 157,143 150,507
Accumulated other comprehensive income 11 1
Accumulated deficit (93,013) (65,399)
Total stockholders' equity 64,542 85,493
Total liabilities and stockholders' equity $ 69,534 $ 89,637