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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Current assets:    
Cash $ 10,568 $ 9,097
Accounts receivable 1,085 2,123
Subscription receivable 286   
Prepaid expenses and other current assets 1,010 550
Total current assets 12,949 11,770
Deposit 69 68
Property and equipment, net 365 330
Total assets 13,383 12,168
Current liabilities:    
Accounts payable 426 539
Accrued expenses 896 804
Deferred revenue 3,479 2,725
Total current liabilities 4,801 4,068
Total liabilities 4,801 4,068
Stockholders' equity:    
Common stock, 70,000,000 shares authorized with par value $0.001 per share; 34,237,513 and 33,331,182 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively 38 33
Additional paid-in capital 157,179 146,677
Accumulated other comprehensive income 13 5
Accumulated deficit (148,648) (138,615)
Total stockholders' equity 8,582 8,100
Total liabilities and stockholders' equity 13,383 12,168
Series A Preferred Stock
    
Stockholders' equity:    
Preferred stock, value      
Series B Preferred Stock
    
Stockholders' equity:    
Preferred stock, value