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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets    
Cash and cash equivalents $ 4,364 $ 2,529
Short-term investments 32,192 30,798
Accounts receivable, net 148 287
Prepaid expenses and other current assets 1,671 1,362
Total current assets 38,375 34,976
Long-term investments 13,926 7,383
Property and equipment, net 706 1,238
Goodwill 23,134 23,134
Intangible assets, net 1,655 2,654
Other assets 193 149
Total assets 77,989 69,534
Current liabilities    
Accounts payable 276 393
Accrued expenses and other liabilities 1,909 3,947
Deferred revenue 170 481
Total current liabilities 2,355 4,821
Long-term liabilities 216 171
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; 48,894 shares and 40,054 shares issued and outstanding at December 31, 2013 and 2012, respectively 489 401
Additional paid-in capital 192,723 157,143
Accumulated other comprehensive income 13 11
Accumulated deficit (117,807) (93,013)
Total stockholders' equity 75,418 64,542
Total liabilities and stockholders' equity $ 77,989 $ 69,534