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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN DEFICIT (USD $) In Thousands, except Share data | Total | Common Shares | Additional Paid-in Capital | Treasury shares | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ (5,962) | $ 113,321 | $ 449,393 | $ (217) | $ (568,459)
Beginning Balance (in shares) at Dec. 31, 2011 |  | 135,832,542 |  |  |
Exercise of warrants (in shares) | 40,000 | 40,000 |  |  |
Exercise of warrants | 59 | 31 | 28 |  |
Transfer of fair value of warrants exercised from liabilities to equity | 321 |  | 321 |  |
Conversion option contained in exchangeable notes | 22,898 |  | 22,898 |  |
Exercise of stock options (in shares) | 554,259 | 554,249 |  |  |
Exercise of stock options | 791 | 438 | 353 |  |
Tax benefits realized from stock-based compensation | 1,884 |  | 1,884 |  |
Share issuances for services (in shares) |  | 894 |  |  |
Shares issued for services | 6 |  | 6 |  |
Stock-based compensation | 3,874 |  | 3,874 |  |
Loss for the period | (88,285) |  |  |  | (88,285)
Ending Balance at Mar. 31, 2012 | (64,414) | 113,790 | 478,757 | (217) | (656,744)
Ending Balance (in shares) at Mar. 31, 2012 |  | 136,427,695 |  |  |
Beginning Balance at Dec. 31, 2012 | (3,997) | 124,597 | 619,266 | (217) | (747,643)
Beginning Balance (in shares) at Dec. 31, 2012 |  | 150,360,933 |  |  |
Exercise of warrants (in shares) | 70,000 | 70,000 |  |  |
Exercise of warrants | 70 | 52 | 18 |  |
Exercise of stock options (in shares) | 260,000 | 260,000 |  |  |
Exercise of stock options | 439 | 196 | 243 |  |
Tax benefits realized from stock-based compensation | 678 |  | 678 |  |
Share issuances for services (in shares) |  | 948 |  |  |
Shares issued for services | 8 | 1 | 7 |  |
Stock-based compensation | 4,874 |  | 4,874 |  |
Loss for the period | (62,158) |  |  |  | (62,158)
Ending Balance at Mar. 31, 2013 | $ (60,086) | $ 124,846 | $ 625,086 | $ (217) | $ (809,801)
Ending Balance (in shares) at Mar. 31, 2013 |  | 150,691,881 |  |  |

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