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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY shares in Thousands, $ in Thousands, $ in Millions | Common Stock USD ($) shares | Warrants USD ($) | Accumulated Deficit USD ($) | Flow Through Common Shares CAD ($) | Flow Through Common Shares USD ($) | At-the-market (“ATM”) USD ($) shares | USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 | shares | 337,051 |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ 1,444,056 | $ 3,823 | $ (926,606) |  |  |  | $ 521,273
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |
Stock-based compensation (note 9) | 203 |  |  |  |  |  | 203
Exercise of stock options (note 8) | $ 40 |  |  |  |  |  | 40
Exercise of stock options (note 8) (in shares) | shares | 35 |  |  |  |  |  |
Shareholder distributions (note 8) | $ (1,686) |  |  |  |  |  | (1,686)
Net (loss) income |  |  | (5,211) |  |  |  | (5,211)
Balance at Mar. 31, 2018 | $ 1,442,613 | 3,823 | (931,817) |  |  |  | 514,619
Balance (in shares) at Mar. 31, 2018 | shares | 337,086 |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2017 | shares | 337,051 |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ 1,444,056 | 3,823 | (926,606) |  |  |  | 521,273
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |
Sale of common stock (note 8) |  |  |  | $ 20.0 | $ 14,900 |  |
Balance at Dec. 31, 2018 | $ 1,457,422 |  | (971,476) |  |  |  | 485,946
Balance (in shares) at Dec. 31, 2018 | shares | 344,560 |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |
Stock-based compensation (note 9) | $ 61 |  |  |  |  |  | 61
Sale of common stock (note 8) |  |  |  |  |  | $ 1,851 |
Sale of common stock (note 8) (in shares) | shares |  |  |  |  |  | 1,010 |
Common stock issued in connection with registered direct offering (note 8) | $ 17,785 |  |  |  |  |  | 17,785
Common stock issued in connection with registered direct offering (note 8) (in shares) | shares | 14,194 |  |  |  |  |  |
Exercise of stock options (note 8) | $ 223 |  |  |  |  |  | 223
Exercise of stock options (note 8) (in shares) | shares | 222 |  |  |  |  |  |
Net (loss) income |  |  | (10,136) |  |  |  | (10,136)
Balance at Mar. 31, 2019 | $ 1,477,342 | 2,467 | $ (981,612) |  |  |  | 498,197
Balance (in shares) at Mar. 31, 2019 | shares | 359,986 |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |
Adoption of ASU 2016-01 (note 2) |  |  |  |  |  |  | 100
Warrants issued in connection with registered direct offering (note 8) |  | $ 2,467 |  |  |  |  | $ 2,467

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