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Consolidated Statements of Changes in Equity - USD ($) $ in Thousands | Total | Common Stock | Deficit | Accumulated other comprehensive income | Total shareholders' equity | Non-controlling interests
--- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2013 |  | 19,601,251 |  |  |  |
Beginning Balance at Dec. 31, 2013 | $ 184,233 | $ 258,109 | $ (73,256) | $ (620) | $ 184,233 | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net loss | (86,635) |  | (86,635) |  | (86,635) | 0
Other comprehensive income | $ 1,205 |  |  | 1,205 | 1,205 |
Shares issued for exercise of stock options (in shares) | 15,000 | 15,000 |  |  |  |
Shares issued for exercise of stock options (Note 15) | $ 120 | $ 120 |  |  | 120 |
Shares issued for exercise of share purchase warrants (in shares) | 49,273 | 61,301 |  |  |  |
Shares issued for exercise of share purchase warrants | $ 483 | $ 483 |  |  | 483 |
Share-based compensation (Note 15) | $ 1,405 | $ 1,405 |  |  | 1,405 |
Share issued for property acquisitions (in shares) | 0 |  |  |  |  |
Share issued for property acquisitions | $ 0 |  |  |  |  |
Shares issued for consulting services | 0 |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2014 |  | 19,677,552 |  |  |  |
Ending Balance at Dec. 31, 2014 | 100,811 | $ 260,117 | (159,891) | 585 | 100,811 | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net loss | (82,357) |  | (82,217) |  | (82,217) | (140)
Other comprehensive income | $ 2,920 |  |  | 2,920 | 2,920 |
Shares issued for exercise of stock options (in shares) | 48,802 | 48,802 |  |  |  |
Shares issued for exercise of stock options (Note 15) | $ 185 | $ 185 |  |  | 185 |
Shares issued for exercise of share purchase warrants (in shares) | 173 | 300 |  |  |  |
Shares issued for exercise of share purchase warrants | $ 2 | $ 2 |  |  | 2 |
Share-based compensation (Note 15) | 1,099 | $ 1,099 |  |  | 1,099 |
Shares issued in connection with the acquisition of Uranerz Energy Corporation (in shares) |  | 25,347,209 |  |  |  |
Shares issued in connection with the acquisition of Uranerz Energy Corporation | 105,673 | $ 105,673 |  |  | 105,673 |
Options issued in connection with the acquisition of Uranerz Energy Corporation (in shares) |  | 0 |  |  |  |
Options issued in connection with the acquisition of Uranerz Energy Corporation | 3,681 | $ 3,681 |  |  | 3,681 |
Shares issued for cash by at-the-market offering (in shares) |  | 1,275,908 |  |  |  |
Shares issued for cash by at-the-market offering (Note 13a) | $ 2,939 | $ 2,939 |  |  | 2,939 |
Share issued for property acquisitions (in shares) | 13,654,488 | 169,361 |  |  |  |
Share issued for property acquisitions | $ 550 | $ 550 |  |  | 550 |
Share issuance cost | (312) | $ (312) |  |  | (312) |
Non-controlling interest upon acquisition of Uranerz Energy Corporation | 3,992 |  |  |  |  | 3,992
Contributions attributable to non-controlling interest | 304 |  |  |  |  | 304
Shares issued for consulting services | 0 |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2015 |  | 46,519,132 |  |  |  |
Ending Balance at Dec. 31, 2015 | 139,487 | $ 373,934 | (242,108) | 3,505 | 135,331 | 4,156
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net loss | (39,864) |  | (39,413) |  | (39,413) | (451)
Other comprehensive income | $ (197) |  |  | (197) | (197) |
Shares issued for exercise of stock options (in shares) | 8,369 | 8,369 |  |  |  |
Shares issued for exercise of stock options (Note 15) | $ 18 | $ 18 |  |  | 18 |
Shares issued for exercise of share purchase warrants (in shares) | 0 |  |  |  |  |
Share-based compensation (Note 15) | $ 2,657 | $ 2,657 |  |  | 2,657 |
Shares issued for cash by at-the-market offering (in shares) |  | 200,225 |  |  |  |
Shares issued for cash by at-the-market offering (Note 13a) | $ 539 | $ 539 |  |  | 539 |
Share issued for property acquisitions (in shares) | 0 |  |  |  |  |
Share issuance cost | $ (2,330) | $ (2,330) |  |  | (2,330) |
Contributions attributable to non-controlling interest | 37 |  |  |  |  | 37
Shares issued for public offering (in shares) |  | 13,368,750 |  |  |  |
Shares issued for public offerings (Note 13b, 13e) | 22,980 | $ 22,980 |  |  | 22,980 |
Shares issued for the vesting of restricted stock units (in shares) |  | 138,608 |  |  |  |
Shares issued for acquistion of Alta Mesa (in shares) |  | 4,551,284 |  |  |  |
Shares issued for acquisition of Alta Mesa (Note 4, 13d) | 11,378 | $ 11,378 |  |  | 11,378 |
Shares issued for acquisition of 40% Roca Honda (in shares) |  | 1,212,173 |  |  |  |
Shares issued for acquisition of 40% interest in Roca Honda (Note 13c) | 2,679 | $ 2,679 |  |  | 2,679 |
Shares issued for consulting services (in shares) |  | 206,612 |  |  |  |
Shares issued for consulting services | 479 | $ 479 |  |  | 479 |
Ending Balance (in shares) at Dec. 31, 2016 |  | 66,205,153 |  |  |  |
Ending Balance at Dec. 31, 2016 | $ 137,863 | $ 412,334 | $ (281,521) | $ 3,308 | $ 134,121 | $ 3,742

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