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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Accumulated Other Comprehensive (Loss) Income
Accumulated Deficit
Balance at Dec. 31, 2009 $ 203,226 $ 501,786 $ (285) $ (298,275)
Balance (in shares) at Dec. 31, 2009   121,893,000    
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation 1,595 1,595    
Exercise of stock options 201 201    
Exercise of stock options (in shares) 109,000 109,000    
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition 608 608    
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition (in shares)   143,000    
Shares issued for Mexico mining concessions 199 199    
Shares issued for Mexico mining concessions (in shares)   41,000    
Unrealized (loss) gain on marketable equity securities, net of taxes 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   122,186,000    
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)   17,250,000    
Exercise of stock options 412 412    
Exercise of stock options (in shares) 163,000 163,000    
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition 361 361    
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition (in shares)   70,000    
Shares issued for Mexico mining concessions 583 583    
Shares issued for Mexico mining concessions (in shares) 84,000 84,000    
Unrealized (loss) gain on marketable equity securities, net of taxes (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   139,753,000    
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation 3,405 3,405    
Issuance of exchangeable shares to acquire Minera Andes Inc. 664,671 664,671    
Issuance of exchangeable shares to acquire Minera Andes Inc. (in shares) 7,800,000 127,331,000    
Assumption of stock options in connection with the acquisition of Minera Andes Inc. 3,175 3,175    
Sale of shares for cash, net of issuance costs 43,047 43,047    
Sale of shares for cash, net of issuance costs (in shares) 19,552,000 19,552,000    
Sale of exchangeable shares for cash, net of issuance costs 17,372 17,372    
Sale of exchangeable shares for cash, net of issuance costs (in shares) 7,800,000 7,799,000    
Exercise of stock options 819 819    
Exercise of stock options (in shares) 445,000 445,000    
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition 3,066 3,066    
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition (in shares)   1,062,000    
Shares issued for Mexico mining concessions 391 391    
Shares issued for Mexico mining concessions (in shares) 83,000 83,000    
Unrealized (loss) gain on marketable equity securities, net of taxes (5)   (5)  
Reclassification of unrealized loss on marketable equity securities disposed of during the year, net of tax (993)   (993)  
Other-than-temporary impairment on marketable equity securities 1,993   1,993  
Net loss (66,654)     (66,654)
Balance at Dec. 31, 2012 $ 889,591 $ 1,349,777 $ (294) $ (459,892)
Balance (in shares) at Dec. 31, 2012   296,025,000