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Consolidated Statements of Stockholders' (Deficit) Equity (USD $) In Thousands, except Share data | Total | Series A Preferred Stock | Series B Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (loss) | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2010 | $ (9,864) |  |  | $ 22 | $ 102,360 | $ (63) | $ (112,183)
Beginning Balances, Shares at Dec. 31, 2010 |  |  |  | 21,817,000 |  |  |
Stock option and warrant compensation expense to employees, directors and vendors | 550 |  |  |  | 550 |  |
Common stock issued upon exercise of common stock warrants | 515 |  |  | 1 | 514 |  |
Common Stock Issued Upon Exercise Of Common Stock Warrants Shares |  |  |  | 543,000 |  |  |
Proceeds from sale of common stock, net of offering costs | 10,787 |  |  | 3 | 10,784 |  |
Proceeds from sale of common stock, net of offering costs, Shares |  |  |  | 3,000,000 |  |  |
Reclassification of derivative liabilities to additional paid-in capital | 20,075 |  |  |  | 20,075 |  |
Fair value of warrants issued in connection with issuance of 2011 senior secured convertible debt | 937 |  |  |  | 937 |  |
Exchange of Series A preferred stock for common stock |  |  |  |  |  |  |
Exchange of Series A Preferred Stock for common stock, shares |  |  |  | 40,000 |  |  |
Exchange of Series B preferred stock for common stock |  |  |  |  |  |  |
Exchange of Series B Preferred Stock for common stock, shares |  |  |  | 6,000 |  |  |
Common stock issued upon conversion of outstanding convertible debt and accrued and bonus income | 7,622 |  |  | 7 | 7,615 |  |
Common stock issued upon conversion of outstanding convertible debt and accrued and bonus income, shares |  |  |  | 7,313,000 |  |  |
Common stock issued for settlement of accrued expenses | 120 |  |  |  | 120 |  |
Common stock issued for settlement of accrued expenses, shares |  |  |  | 60,000 |  |  |
Foreign currency translation adjustment | 76 |  |  |  |  | 76 |
Net loss | (17,145) |  |  |  |  |  | (17,145)
Ending Balance at Dec. 31, 2011 | 13,673 |  |  | 33 | 142,955 | 13 | (129,328)
Ending Balances, shares at Dec. 31, 2011 |  |  |  | 32,779,000 |  |  |
Stock option and warrant compensation expense to employees, directors and vendors | 3,499 |  |  |  | 3,499 |  |
Common stock issued upon exercise of common stock warrants | 223 |  |  |  | 223 |  |
Common Stock Issued Upon Exercise Of Common Stock Warrants Shares |  |  |  | 550,000 |  |  |
Exchange of Series B preferred stock for common stock |  |  |  |  |  |  |
Exchange of Series B Preferred Stock for common stock, shares |  |  |  | 2,000 |  |  |
Foreign currency translation adjustment | (8) |  |  |  |  | (8) |
Net loss | (9,287) |  |  |  |  |  | (9,287)
Ending Balance at Dec. 31, 2012 | 8,100 |  |  | 33 | 146,677 | 5 | (138,615)
Ending Balances, shares at Dec. 31, 2012 |  |  |  | 33,331,000 |  |  |
Stock option and warrant compensation expense to employees, directors and vendors | 2,656 |  |  |  | 2,656 |  |
Common stock issued upon exercise of common stock warrants | 714 |  |  | 3 | 711 |  |
Common Stock Issued Upon Exercise Of Common Stock Warrants Shares |  |  |  | 3,152,000 |  |  |
Common stock issued upon exercise of common stock options | 1,060 |  |  |  | 1,060 |  |
Common stock issued upon exercise of common stock options, Shares |  |  |  | 241,000 |  |  |
Proceeds from sale of common stock, net of offering costs | 6,892 |  |  | 2 | 6,890 |  |
Proceeds from sale of common stock, net of offering costs, Shares |  |  |  | 1,169,000 |  |  |
Exchange of Series A preferred stock for common stock |  |  |  |  |  |  |
Exchange of Series A Preferred Stock for common stock, shares |  |  |  | 40,000 |  |  |
Exchange of Series B preferred stock for common stock |  |  |  |  |  |  |
Exchange of Series B Preferred Stock for common stock, shares |  |  |  | 1,000 |  |  |
Foreign currency translation adjustment | 6 |  |  |  |  | 6 |
Net loss | (13,080) |  |  |  |  |  | (13,080)
Ending Balance at Dec. 31, 2013 | $ 6,348 |  |  | $ 38 | $ 157,994 | $ 11 | $ (151,695)
Ending Balances, shares at Dec. 31, 2013 |  |  |  | 37,934,000 |  |  |

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