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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
Accumulated Deficit
Flow-through common shares
Total
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   $ 302     302
Exercise of stock options   $ 61     $ 61
Exercise of stock options (in shares)   60,000     60,000
Shares issued for debt refinancing   $ 1,875     $ 1,875
Shares issued for debt refinancing (in shares)   2,092,000      
Net loss     (119,005)   (119,005)
Balance at Jun. 30, 2020   $ 1,532,940 (1,150,228)   382,712
Balance (in shares) at Jun. 30, 2020   402,491,000      
Balance at Mar. 31, 2020   $ 1,530,852 (1,130,414)   400,438
Balance (in shares) at Mar. 31, 2020   400,399,000      
Increase (Decrease) in Shareholders' Equity          
Stock-based compensation   $ 213     213
Shares issued for debt refinancing   $ 1,875     1,875
Shares issued for debt refinancing (in shares)   2,092,000      
Net loss     (19,814)   (19,814)
Balance at Jun. 30, 2020   $ 1,532,940 (1,150,228)   382,712
Balance (in shares) at Jun. 30, 2020   402,491,000      
Balance at Dec. 31, 2020   $ 1,548,876 (1,183,548)   365,328
Balance (in shares) at Dec. 31, 2020   416,587,000      
Increase (Decrease) in Shareholders' Equity          
Stock-based compensation   $ 439     $ 439
Exercise of stock options (in shares)         0
Stock issued during the period $ 10,785 $ 29,875   $ 10,785 $ 29,875
Stock issued during the period (in shares) 12,601,000 30,000,000      
Net loss     (18,455)   (18,455)
Balance at Jun. 30, 2021   $ 1,589,975 (1,202,003)   387,972
Balance (in shares) at Jun. 30, 2021   459,188,000      
Balance at Mar. 31, 2021   $ 1,589,763 (1,196,014)   393,749
Balance (in shares) at Mar. 31, 2021   459,188,000      
Increase (Decrease) in Shareholders' Equity          
Stock-based compensation   $ 212     212
Net loss     (5,989)   (5,989)
Balance at Jun. 30, 2021   $ 1,589,975 $ (1,202,003)   $ 387,972
Balance (in shares) at Jun. 30, 2021   459,188,000