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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY (USD $) In Thousands, except Share data | Total | Common Shares | Additional Paid-in Capital | Treasury Stock | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2009 | $ 6,597 | $ 84,219 | $ 172,339 | $ (217) | $ (249,744)
Beginning Balance (in shares) at Dec. 31, 2009 |  | 98,801,982 |  |  |
Exercise of warrants (in shares) |  | 6,344,136 |  |  |
Exercise of warrants | 8,904 | 4,906 | 3,998 |  |
Exercise of stock options (in shares) |  | 1,706,016 |  |  |
Exercise of stock options | 3,642 | 1,336 | 2,306 |  |
Tax benefits realized from stock-based compensation | 543 |  | 543 |  |
Transfer of fair value of warrants exercised from liabilities to equity | 22,317 |  | 22,317 |  |
Share issuances for services (in shares) |  | 4,597 |  |  |
Share issuances for services | 12 | 4 | 8 |  |
Stock-based compensation | 5,207 |  | 5,207 |  |
Net loss | (249,589) |  |  |  | (249,589)
Ending Balance at Dec. 31, 2010 | (202,367) | 90,465 | 206,718 | (217) | (499,333)
Ending Balance (in shares) at Dec. 31, 2010 |  | 106,856,731 |  |  |
Exercise of warrants (in shares) | 12,888,369 | 12,888,369 |  |  |
Exercise of warrants | 18,702 | 10,289 | 8,413 |  |
Exercise of stock options (in shares) | 2,273,221 | 2,273,221 |  |  |
Exercise of stock options | 5,094 | 1,833 | 3,261 |  |
Stock issued in January financing (in shares) |  | 13,800,000 |  |  |
Stock issued in January financing | 98,654 | 10,723 | 87,931 |  |
Tax benefits realized from stock-based compensation | 4,199 |  | 4,199 |  |
Transfer of fair value of warrants exercised from liabilities to equity | 129,517 |  | 129,517 |  |
Share issuances for services (in shares) |  | 14,221 |  |  |
Share issuances for services | 71 | 11 | 60 |  |
Stock-based compensation | 9,294 |  | 9,294 |  |
Net loss | (69,126) |  |  |  | (69,126)
Ending Balance at Dec. 31, 2011 | (5,962) | 113,321 | 449,393 | (217) | (568,459)
Ending Balance (in shares) at Dec. 31, 2011 |  | 135,832,542 |  |  |
Exercise of warrants (in shares) | 11,047,579 | 11,047,579 |  |  |
Exercise of warrants | 16,720 | 8,540 | 8,180 |  |
Exercise of stock options (in shares) | 3,380,413 | 3,380,413 |  |  |
Exercise of stock options | 8,205 | 2,659 | 5,546 |  |
Vesting of restricted stock units (in shares) |  | 97,398 |  |  |
Vesting of restricted stock units |  | 76 | (76) |  |
Conversion option contained in exchangeable notes | 22,898 |  | 22,898 |  |
Tax benefits realized from stock-based compensation | 11,334 |  | 11,334 |  |
Transfer of fair value of warrants exercised from liabilities to equity | 103,885 |  | 103,885 |  |
Share issuances for services (in shares) |  | 3,001 |  |  |
Share issuances for services | 32 | 1 | 31 |  |
Stock-based compensation | 18,075 |  | 18,075 |  |
Net loss | (179,184) |  |  |  | (179,184)
Ending Balance at Dec. 31, 2012 | $ (3,997) | $ 124,597 | $ 619,266 | $ (217) | $ (747,643)
Ending Balance (in shares) at Dec. 31, 2012 |  | 150,360,933 |  |  |

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