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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Current assets:    
Cash $ 11,275 $ 12,940
Accounts receivable 1,725 3,345
Prepaid expenses and other current assets 327 234
Total current assets 13,327 16,519
Property and equipment, net 332 108
Total assets 13,659 16,627
Current liabilities:    
Accounts payable 351 447
Accrued expenses 776 601
Deferred revenue 1,543 1,906
Total current liabilities 2,670 2,954
Total liabilities 2,670 2,954
Stockholders' equity:    
Common stock, 70,000,000 shares authorized with par value $0.001per share; 32,972,631 and 32,778,993 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively 33 33
Additional paid-in capital 145,314 142,955
Accumulated other comprehensive (loss) income (15) 13
Accumulated deficit (134,343) (129,328)
Total stockholders' equity 10,989 13,673
Total liabilities and stockholders' equity 13,659 16,627
Series A Preferred Stock [Member]
    
Stockholders' equity:    
Preferred stock, value      
Series B Preferred Stock [Member]
    
Stockholders' equity:    
Preferred stock, value