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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current assets:    
Cash $ 9,097 $ 12,940
Accounts receivable 2,123 3,345
Prepaid expenses and other current assets 550 234
Total current assets 11,770 16,519
Non - current assets:    
Deposit 68   
Property and equipment, net 330 108
Total non - current assets 398 108
Total assets 12,168 16,627
Current liabilities:    
Accounts payable 539 447
Accrued expenses 804 601
Deferred revenue 2,725 1,906
Total current liabilities 4,068 2,954
Total liabilities 4,068 2,954
Commitments and contingencies (Note 11)    [1]    [1]
Stockholders' equity:    
Common stock, 70,000,000 shares authorized at December 31, 2012 and 2011, respectively, with par value of $0.001; 33,331,182 and 32,778,993 shares issued and outstanding at December 31, 2012 and 2011, respectively 33 33
Additional paid - in capital 146,677 142,955
Accumulated other comprehensive income 5 13
Accumulated deficit (138,615) (129,328)
Total stockholders' equity 8,100 13,673
Total liabilities and stockholders' equity 12,168 16,627
Series A Preferred Stock
    
Stockholders' equity:    
Preferred stock, value      
Series B Preferred Stock
    
Stockholders' equity:    
Preferred stock, value      
[1] Note 11