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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock and Additional Paid-in Capital Lexam VG Gold | Common Stock and Additional Paid-in Capital Registered direct offering | Common Stock and Additional Paid-in Capital | Accumulated Other Comprehensive (Loss) Income | Accumulated Deficit | Lexam VG Gold | Black Fox | Registered direct offering | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 |  |  | $ 1,360,345 | $ 1,666 | $ (918,972) |  |  |  | $ 443,039
Balance (in shares) at Dec. 31, 2016 |  |  | 299,570,000 |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  | $ 1,311 |  |  |  |  |  | 1,311
Shares issued in connection with acquisitions | $ 38,141 |  |  |  |  | $ 38,141 |  |  |
Shares issued in connection with acquisitions (in shares) | 12,687,000 |  |  |  |  |  |  |  |
Stock issued during the period |  |  | $ 43,220 |  |  |  |  |  | 43,220
Stock issued during the period (in shares) |  |  | 20,700,000 |  |  |  |  |  |
Exercise of stock options |  |  | $ 122 |  |  |  |  |  | $ 122
Exercise of stock options (in shares) |  |  | 94,000 |  |  |  |  |  | 94,000
Shareholder distributions |  |  | $ (3,059) |  |  |  |  |  | $ (3,059)
Other-than-temporary impairment on marketable equity securities |  |  |  | 356 |  |  |  |  | 356
Reclassification of unrealized gain on marketable securities disposed of during the period, net of taxes |  |  |  | (840) |  |  |  |  | (840)
Unrealized gain on available-for-sale securities, net of taxes |  |  |  | 1,818 |  |  |  |  | 1,818
Net loss |  |  |  |  | (10,634) |  |  |  | (10,634)
Balance at Dec. 31, 2017 |  |  | $ 1,447,879 | 3,000 | (929,606) |  |  |  | 521,273
Balance (in shares) at Dec. 31, 2017 |  |  | 337,051,000 |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |
Adoption of ASU 2016-01 (note 2) | Accounting Standards Update 2016-01 |  |  |  | $ (3,000) | 3,000 |  |  |  |
Balance |  |  | $ 1,447,879 |  | (926,606) |  |  |  | 521,273
Stock-based compensation |  |  | 269 |  |  |  |  |  | 269
Shares issued in connection with acquisitions (in shares) |  |  |  |  |  |  | 178,321 |  |
Stock issued during the period |  |  | $ 918 |  |  |  |  |  | 918
Stock issued during the period (in shares) |  |  | 515,000 |  |  |  |  |  |
Exercise of stock options |  |  | $ 192 |  |  |  |  |  | $ 192
Exercise of stock options (in shares) |  |  | 182,000 |  |  |  |  |  | 171,000
Shareholder distributions |  |  | $ (3,372) |  |  |  |  |  | $ (3,372)
Shares issued for acquisition of mineral property interests |  |  | $ 391 |  |  |  |  |  | 391
Shares issued for acquisition of mineral property interests (in shares) |  |  | 178,000 |  |  |  |  |  |
Net loss |  |  |  |  | (44,870) |  |  |  | (44,870)
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 |  |  | $ 694 |  |  |  |  |  | 694
Stock issued during the period |  | $ 69,467 | $ 1,851 |  |  |  |  | $ 69,467 | 1,851
Stock issued during the period (in shares) |  | 53,880,000 | 1,010,000 |  |  |  |  |  |
Exercise of stock options |  |  | $ 544 |  |  |  |  |  | $ 544
Exercise of stock options (in shares) |  |  | 535,000 |  |  |  |  |  | 535,000
Shares issued for acquisition of mineral property interests |  |  | $ 724 |  |  |  |  |  | $ 724
Shares issued for acquisition of mineral property interests (in shares) |  |  | 354,000 |  |  |  |  |  |
Net loss |  |  |  |  | (59,747) |  |  |  | (59,747)
Balance at Dec. 31, 2019 |  |  | $ 1,530,702 |  | $ (1,031,223) |  |  |  | $ 499,479
Balance (in shares) at Dec. 31, 2019 |  |  | 400,339,000 |  |  |  |  |  |

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