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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2014 |  | 130,146,341 |  |  |
Beginning balance at Dec. 31, 2014 | $ 37,059 | $ 12 | $ 256,377 | $ (215,481) | $ (3,849)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock, shares |  | 32,158,685 |  |  |
Issuance of common stock | 47,416 | $ 3 | 47,413 |  |
Issuance of common stock upon exercise of warrants, shares |  | 0 |  |  |
Common stock warrants issued in connection with March 2015 common stock offering | (10,296) | $ 0 | (10,296) |  |
Issuance of common stock in connection with employee stock purchase plan, shares |  | 231,312 |  |  |
Issuance of common stock in connection with employee stock purchase plan | 309 |  | 309 |  |
Stock-based compensation for directors and employees | $ 2,122 |  | 2,122 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 39,000 | 39,108 |  |  |
Stock Issued During Period, Value, Stock Options Exercised | $ 31 |  | 31 |  |
Net loss | (44,224) |  |  | (44,224) |
Ending balance, shares at Sep. 30, 2015 |  | 162,575,446 |  |  |
Ending balance at Sep. 30, 2015 | $ 32,417 | $ 15 | $ 295,956 | $ (259,705) | $ (3,849)

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