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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Total | Common Stock | Accumulated Other Comprehensive (Loss) Income | Accumulated Deficit
--- | --- | --- | --- | ---
Balance at Dec. 31, 2008 | $ 183,194 | $ 454,052 | $ (281) | $ (270,577)
Balance (in shares) at Dec. 31, 2008 |  | 96,676 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 1,292 | 1,292 |  |
Sale of shares for cash, net of issuance costs | 46,301 | 46,301 |  |
Sale of shares for cash, net of issuance costs (in shares) |  | 25,150 |  |
Exercise of stock options | 141 | 141 |  |
Exercise of stock options (in shares) |  | 67 |  |
Unrealized gain (loss) on marketable equity securities | (4) |  | (4) |
Net loss | (27,698) |  |  | (27,698)
Balance at Dec. 31, 2009 | 203,226 | 501,786 | (285) | (298,275)
Balance (in shares) at Dec. 31, 2009 |  | 121,893 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 1,595 | 1,595 |  |
Exercise of stock options | 201 | 201 |  |
Exercise of stock options (in shares) |  | 109 |  |
Exercise of stock options from 2007 acquisition | 608 | 608 |  |
Exercise of stock options from 2007 acquisition (in shares) |  | 143 |  |
Shares issued for Mexico mining concessions | 199 | 199 |  |
Shares issued for Mexico mining concessions (in shares) |  | 41 |  |
Unrealized gain (loss) on marketable equity securities | 542 |  | 542 |
Net loss | (33,091) |  |  | (33,091)
Balance at Dec. 31, 2010 | 173,280 | 504,389 | 257 | (331,366)
Balance (in shares) at Dec. 31, 2010 |  | 122,186 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 2,671 | 2,671 |  |
Sale of shares for cash, net of issuance costs | 105,415 | 105,415 |  |
Sale of shares for cash, net of issuance costs (in shares) |  | 17,250 |  |
Exercise of stock options | 412 | 412 |  |
Exercise of stock options (in shares) |  | 163 |  |
Exercise of stock options from 2007 acquisition | 361 | 361 |  |
Exercise of stock options from 2007 acquisition (in shares) |  | 70 |  |
Shares issued for Mexico mining concessions | 583 | 583 |  |
Shares issued for Mexico mining concessions (in shares) |  | 84 |  |
Unrealized gain (loss) on marketable equity securities | (1,546) |  | (1,546) |
Net loss | (61,872) |  |  | (61,872)
Balance at Dec. 31, 2011 | $ 219,304 | $ 613,831 | $ (1,289) | $ (393,238)
Balance (in shares) at Dec. 31, 2011 |  | 139,753 |  |

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