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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