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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock Registered direct offering | Common Stock ATM offering | Common Stock | Warrants | Accumulated Deficit | Registered direct offering | ATM offering | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  |  | 337,051,000 |  |  |  |  |
Balance at Dec. 31, 2017 |  |  | $ 1,447,879 |  | $ (926,606) |  |  | $ 521,273
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Stock-based compensation |  |  | 182 |  |  |  |  | 182
Exercise of stock options |  |  | $ 63 |  |  |  |  | $ 63
Exercise of stock options (in shares) |  |  | 57,000 |  |  |  |  | 57,199
Shareholder distribution |  |  | $ (3,373) |  |  |  |  | $ (3,373)
Shares issued for acquisition of mineral property interests |  |  | $ 391 |  |  |  |  | 391
Shares issued for acquisition of mineral property interests (in shares) |  |  | 178,000 |  |  |  |  |
Net income (loss) |  |  |  |  | (23,881) |  |  | (23,881)
Balance at Sep. 30, 2018 |  |  | $ 1,445,142 |  | (950,487) |  |  | 494,655
Balance (in shares) at Sep. 30, 2018 |  |  | 337,286,000 |  |  |  |  |
Balance at Jun. 30, 2018 |  |  | $ 1,447,025 |  | (937,197) |  |  | 509,828
Balance (in shares) at Jun. 30, 2018 |  |  | 337,268,000 |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Stock-based compensation |  |  | $ (214) |  |  |  |  | (214)
Exercise of stock options |  |  | $ 18 |  |  |  |  | 18
Exercise of stock options (in shares) |  |  | 18,000 |  |  |  |  |
Shareholder distribution |  |  | $ (1,687) |  |  |  |  | (1,687)
Net income (loss) |  |  |  |  | (13,290) |  |  | (13,290)
Balance at Sep. 30, 2018 |  |  | $ 1,445,142 |  | (950,487) |  |  | 494,655
Balance (in shares) at Sep. 30, 2018 |  |  | 337,286,000 |  |  |  |  |
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
Stock issued during the period | $ 22,910 | $ 1,851 | 20,300 | $ 2,600 |  | $ 22,910 | $ 1,851 | 22,900
Stock issued during the period (in shares) | 16,129,000 | 1,010,000 |  |  |  |  |  |
Exercise of stock options |  |  | $ 411 |  |  |  |  | $ 411
Exercise of stock options (in shares) |  |  | 405,000 |  |  |  |  | 405,000
Shares issued for acquisition of mineral property interests |  |  | $ 724 |  |  |  |  | $ 724
Shares issued for acquisition of mineral property interests (in shares) |  |  | 354,000 |  |  |  |  |
Net income (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 income (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 |  |  |  |  |

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