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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock and Additional Paid-in Capital
Flow-through common shares
Common Stock and Additional Paid-in Capital
Registered direct offering
Common Stock and Additional Paid-in Capital
ATM offering
Common Stock and Additional Paid-in Capital
Accumulated Deficit
Flow-through common shares
Registered direct offering
ATM offering
Total
Balance at Dec. 31, 2018       $ 1,457,422 $ (971,476)       $ 485,946
Balance (in shares) at Dec. 31, 2018       344,560,000          
Increase (Decrease) in Shareholders' Equity                  
Stock-based compensation       $ 481         481
Exercise of stock options       $ 411         $ 411
Exercise of stock options (in shares)       405,000         405,000
Units issued in connection with registered direct offering , net of issuance costs   $ 22,910         $ 22,910    
Units issued in connection with registered direct offering , net of issuance costs (in shares)   16,129,000              
Stock issued during the period     $ 1,851         $ 1,851  
Stock issued during the period (in shares)     1,010,000            
Shares issued for acquisition of mineral property interests       $ 724         $ 724
Shares issued for acquisition of mineral property interests (in shares)       354,000          
Net loss         (34,615)       (34,615)
Balance at Sep. 30, 2019       $ 1,483,799 (1,006,091)       477,708
Balance (in shares) at Sep. 30, 2019       362,458,000          
Balance at Jun. 30, 2019       $ 1,482,640 (994,626)       488,014
Balance (in shares) at Jun. 30, 2019       361,957,000          
Increase (Decrease) in Shareholders' Equity                  
Stock-based compensation       $ 284         284
Exercise of stock options       $ 151         151
Exercise of stock options (in shares)       147,000          
Shares issued for acquisition of mineral property interests       $ 724         724
Shares issued for acquisition of mineral property interests (in shares)       354,000          
Net loss         (11,465)       (11,465)
Balance at Sep. 30, 2019       $ 1,483,799 (1,006,091)       477,708
Balance (in shares) at Sep. 30, 2019       362,458,000          
Balance at Dec. 31, 2019       $ 1,530,702 (1,031,223)       499,479
Balance (in shares) at Dec. 31, 2019       400,339,000          
Increase (Decrease) in Shareholders' Equity                  
Stock-based compensation       $ 332         332
Exercise of stock options       $ 61         $ 61
Exercise of stock options (in shares)       60,000         60,000
Stock issued during the period $ 7,767         $ 7,767      
Stock issued during the period (in shares) 6,298,000                
Shares issued for debt refinancing       $ 1,875         $ 1,875
Shares issued for debt refinancing (in shares)       2,092,000          
Shares issued for acquisition of mineral property interests       $ 70         70
Shares issued for acquisition of mineral property interests (in shares)       53,000          
Net loss         (128,783)       (128,783)
Balance at Sep. 30, 2020       $ 1,540,807 (1,160,006)       380,801
Balance (in shares) at Sep. 30, 2020       408,842,000          
Balance at Jun. 30, 2020       $ 1,532,940 (1,150,228)       382,712
Balance (in shares) at Jun. 30, 2020       402,491,000          
Increase (Decrease) in Shareholders' Equity                  
Stock-based compensation       $ 30         30
Stock issued during the period $ 7,767         $ 7,767      
Stock issued during the period (in shares) 6,298,000                
Shares issued for acquisition of mineral property interests       $ 70         $ 70
Shares issued for acquisition of mineral property interests (in shares)       53,000         53,600
Net loss         (9,778)       $ (9,778)
Balance at Sep. 30, 2020       $ 1,540,807 $ (1,160,006)       $ 380,801
Balance (in shares) at Sep. 30, 2020       408,842,000