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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock Direct Offering | Common Stock ATM offering | Common Stock | Warrants Direct Offering | Warrants | Accumulated Deficit | Direct Offering | ATM offering | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  |  | $ 1,444,056 |  | $ 3,823 | $ (926,606) |  |  | $ 521,273
Balance (in shares) at Dec. 31, 2017 |  |  | 337,051,000 |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  | $ 396 |  |  |  |  |  | 396
Exercise of stock options |  |  | $ 45 |  |  |  |  |  | $ 45
Exercise of stock options (in shares) |  |  | 39,000 |  |  |  |  |  | 39,199
Shareholder distribution |  |  | $ (1,686) |  |  |  |  |  | $ (1,686)
Shares issued for acquisition of mineral property interests |  |  | $ 391 |  |  |  |  |  | 391
Shares issued for acquisition of mineral property interests (in shares) |  |  | 178,000 |  |  |  |  |  |
Net loss |  |  |  |  |  | (10,591) |  |  | (10,591)
Balance at Jun. 30, 2018 |  |  | $ 1,443,202 |  | 3,823 | (937,197) |  |  | 509,828
Balance (in shares) at Jun. 30, 2018 |  |  | 337,268,000 |  |  |  |  |  |
Balance at Mar. 31, 2018 |  |  | $ 1,442,613 |  | 3,823 | (931,817) |  |  | 514,619
Balance (in shares) at Mar. 31, 2018 |  |  | 337,086,000 |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  | $ 193 |  |  |  |  |  | 193
Exercise of stock options |  |  | $ 5 |  |  |  |  |  | 5
Exercise of stock options (in shares) |  |  | 4,000 |  |  |  |  |  |
Shares issued for acquisition of mineral property interests |  |  | $ 391 |  |  |  |  |  | 391
Shares issued for acquisition of mineral property interests (in shares) |  |  | 178,000 |  |  |  |  |  |
Net loss |  |  |  |  |  | (5,380) |  |  | (5,380)
Balance at Jun. 30, 2018 |  |  | $ 1,443,202 |  | 3,823 | (937,197) |  |  | 509,828
Balance (in shares) at Jun. 30, 2018 |  |  | 337,268,000 |  |  |  |  |  |
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 issued during the period |  |  |  |  |  |  |  | $ 1,900 |
Balance at Mar. 31, 2019 |  |  | $ 1,477,342 |  | 2,467 | (981,612) |  |  | 498,197
Balance (in shares) at Mar. 31, 2019 |  |  | 359,986,000 |  |  |  |  |  |
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 |  |  | $ 197 |  |  |  |  |  | 197
Stock issued during the period | $ 20,276 | $ 1,851 | 20,300 | $ 2,634 | 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 |  |  | $ 260 |  |  |  |  |  | $ 260
Exercise of stock options (in shares) |  |  | 258,000 |  |  |  |  |  | 257,500
Net loss |  |  |  |  |  | (23,150) |  |  | $ (23,150)
Balance at Jun. 30, 2019 |  |  | $ 1,480,006 |  | 2,634 | (994,626) |  |  | 488,014
Balance (in shares) at Jun. 30, 2019 |  |  | 361,957,000 |  |  |  |  |  |
Balance at Mar. 31, 2019 |  |  | $ 1,477,342 |  | 2,467 | (981,612) |  |  | 498,197
Balance (in shares) at Mar. 31, 2019 |  |  | 359,986,000 |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  | $ 136 |  |  |  |  |  | 136
Stock issued during the period | $ 2,491 |  |  | $ 167 |  |  | $ 2,658 |  |
Stock issued during the period (in shares) | 1,935,000 |  |  |  |  |  |  |  |
Exercise of stock options |  |  | $ 37 |  |  |  |  |  | 37
Exercise of stock options (in shares) |  |  | 36,000 |  |  |  |  |  |
Net loss |  |  |  |  |  | (13,014) |  |  | (13,014)
Balance at Jun. 30, 2019 |  |  | $ 1,480,006 |  | $ 2,634 | $ (994,626) |  |  | $ 488,014
Balance (in shares) at Jun. 30, 2019 |  |  | 361,957,000 |  |  |  |  |  |

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