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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash $ 5,354 $ 9,097
Accounts receivable 690 2,123
Prepaid expenses and other current assets 907 550
Total current assets 6,951 11,770
Deposit 67 68
Property and equipment, net 295 330
Total assets 7,313 12,168
Current liabilities:    
Accounts payable 319 539
Accrued expenses 1,012 804
Deferred revenue 2,813 2,725
Total current liabilities 4,144 4,068
Total liabilities 4,144 4,068
Commitments and contingencies (Note 6)      
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 34 33
Additional paid - in capital 148,381 146,677
Accumulated other comprehensive income 59 5
Accumulated deficit (145,305) (138,615)
Total stockholders' equity 3,169 8,100
Total liabilities and stockholders' equity 7,313 12,168
Series A Preferred Stock
    
Stockholders' equity:    
Preferred stock, value      
Series B Preferred Stock
    
Stockholders' equity:    
Preferred stock, value