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Derivative Instruments - Additional Information (Detail)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 190 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2000
USD ($)
Jun. 30, 1999
USD ($)
Jun. 30, 1997
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2012
Jun. 30, 2012
Investor warrants expiring April 30, 2015
USD ($)
Jun. 30, 2011
Investor warrants expiring April 30, 2015
USD ($)
Jun. 30, 2012
Investor warrants expiring April 30, 2015
USD ($)
Jun. 30, 2011
Investor warrants expiring April 30, 2015
USD ($)
Jun. 30, 2012
Investor warrants expiring April 30, 2015
Dec. 31, 2011
Investor warrants expiring April 30, 2015
USD ($)
Jun. 30, 2012
Investor warrants expiring March 29, 2016
USD ($)
Jun. 30, 2011
Investor warrants expiring March 29, 2016
USD ($)
Mar. 31, 2011
Investor warrants expiring March 29, 2016
USD ($)
Jun. 30, 2012
Investor warrants expiring March 29, 2016
USD ($)
Jun. 30, 2011
Investor warrants expiring March 29, 2016
USD ($)
Jun. 30, 2012
Investor warrants expiring March 29, 2016
Dec. 31, 2011
Investor warrants expiring March 29, 2016
USD ($)
Mar. 31, 2011
Investor warrants expiring March 29, 2016
Rights
USD ($)
Jun. 30, 2012
Rights Offering Derivative
USD ($)
Jun. 30, 2011
Rights Offering Derivative
USD ($)
Mar. 31, 2011
Rights Offering Derivative
USD ($)
Jun. 30, 2012
Rights Offering Derivative
USD ($)
Jun. 30, 2011
Rights Offering Derivative
USD ($)
Jun. 30, 2012
Rights Offering Derivative
Mar. 02, 2011
Rights Offering Derivative
USD ($)
Jun. 30, 2012
Rights Offering Derivative
Canadian Dollar
Jun. 30, 2012
Options to Contractors
USD ($)
Jun. 30, 2011
Options to Contractors
USD ($)
Jun. 30, 2012
Options to Contractors
USD ($)
Jun. 30, 2011
Options to Contractors
USD ($)
Dec. 31, 2011
Options to Contractors
Derivative [Line Items]                                                                        
Common shares issuable upon exercise of outstanding warrants                 18,035,000 13,337,000 [1]   13,337,000 [1]       4,698,000 [2]     4,698,000 [2]                                  
Warrant exercise price                           1.44 [1]             1.44 [2]     0.0303     0.0303       0.03          
Expiration Date                       Apr. 30, 2015 [1]             Mar. 29, 2016 [2]                                  
Fair value of warrants                   $ 691   $ 691     $ 3,672 $ 394     $ 394     $ 1,340                            
Unrealized/realized gain (loss) on derivatives 645 225 3,971 5,905       8,792   513 154 2,981 5,221     125 71   946 71       0 0 613 0 613       7 0 44 0  
Rights offered for each common shares held                                               1     1                 194,000
Weighted average exercise price of warrants                 1.44                                       0.08              
Derivative financial liability                                                           1,250            
Issuance of stock (in shares)                                   84,559,000         4,697,000                          
Issuance of units, net of issue costs 0 0 0 2,566       86,443                   2,566                                    
Issuance of stock         793 1,615 0                               1,023                          
Rights offering, issuance costs                                             $ 300                          
[1] On April 30, 2010, the Company announced that it had completed a first closing of a non-brokered private placement ("Private Placement") of 240,066 units, at a price of CAD $0.03 per unit for net proceeds of CAD$7,200. Each unit consisted of one common share and one common share purchase warrant (a "Warrant"). As a result of the Share Consolidation, each eighteen (18) Warrants now entitle the holder thereof to purchase one common share of the Company at a purchase price of CAD$1.44 per whole share for a period of five years from the issue date.
[2] On March 29, 2011, the Company announced that it had completed a non-brokered rights offering of 84,559 units, at a price of CAD $0.03 per unit for total net proceeds of $2,547. Each unit consisted of one common share and one common share purchase warrant (a "Warrant"). As a result of the Share Consolidation, each eighteen (18) Warrants now entitle the holder thereof to purchase one common share of the Company at a purchase price of CAD$1.44 per whole share for a period of five years from the issue date.