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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 |  |

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