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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net loss $ (9,287) $ (17,145) $ (31,626)
Adjustments to reconcile net loss to net cash used in operating activities:      
Stock-based compensation 3,499 550 5,430
Fair value of common stock issued in settlements     647
Depreciation and amortization 97 26 11
Loss on extinguishment of debt       2,416
Debt discounts and deferred financing fees and the - valuation of conversion features and warrants    14,735 19,963
Changes in operating assets and liabilities:      
Accounts receivable 1,253 (3,228) (146)
Prepaid expenses and other current assets (296) (79) (16)
Accounts payable and accrued expenses 239 322 (414)
Deposits (68)      
Deferred revenue 819 1,366 540
Net cash used in operating activities (3,744) (3,453) (3,195)
Cash flows used in investing activities:      
Purchase of property and equipment (310) (114) (14)
Cash flow from financing activities:      
Proceeds from issuance of convertible debt    4,228 1,597
Repayment of convertible debt    (25)   
Proceeds from exercise of warrants 223 515 49
Proceeds from issuance of common stock, warrant repricing and preferred stock    10,787 2,421
Net cash provided by financing activities 223 15,505 4,067
Effect of exchange rates on cash (12) 91 25
Net (decrease) increase in cash (3,843) 12,029 883
Cash at beginning of year 12,940 911 28
Cash at end of year 9,097 12,940 911
Supplemental disclosure of cash flow information:      
Cash paid for interest    27 180
Cash paid for income taxes 125 78 45
Supplemental disclosure of non-cash transactions from investing and financing activities:      
Exchange of preferred stock for common stock       806
Reclassification of derivative liabilities to additional paid-in capital upon conversion of debt and exercise of warrants    20,075 19,286
Value of shares of common stock and warrants issued to brokers in connection with financing, recorded as debt issuance costs and debt discount       129
Debt issuance costs recorded as part of 2011 financing transaction    35   
Debt discount recorded as part of convertible debt financing transactions, including warrants issued in financing transactions    4,228 1,761
Accounts payable converted in 2010 convertible debt offering       163
Accrued expenses settle with shares of common stock    120   
Conversion of debt and accrued interest to shares of common stock    7,222 179
Debt issuance costs recorded in connection of debt extinguishment transactions    20,075 4,336
Reduction of derivative liabilities upon conversion of debt and exercise of warrants       $ 8