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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 | At The Market Sale Of Stock | At The Market Sale Of Stock Common Stock
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2014 |  | 19,677,552 |  |  |  |  |  |
Beginning 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 consulting services | $ 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 | 1,099 | $ 1,099 |  |  | 1,099 |  |  |
Noncontrolling Interest, Period Increase (Decrease) | 3,992 |  |  |  |  | 3,992 |  |
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 |  |  |
Stock Issuance Costs | (312) | $ (312) |  |  | (312) |  |  |
Shares issued for cash by at-the-market offering (in shares) |  | 1,275,908 |  |  |  |  |  |
Sale of stock consideration received |  |  |  |  |  |  | $ 2,940 |
Shares issued for cash by at-the-market offering | $ 2,939 | $ 2,939 |  |  | 2,939 |  |  |
Share issued for property acquisitions (in shares) | 13,654,488 | 169,361 |  |  |  |  |  |
Share issued for property acquisitions | $ 550 |  |  |  |  |  |  |
Share issuance cost | (550) | $ (550) |  |  | (550) |  |  |
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 consulting services | $ 18 | $ 18 |  |  | 18 |  |  |
Shares issued for exercise of share purchase warrants (in shares) | 0 | 138,608 |  |  |  |  |  |
Shares issued for exercise of share purchase warrants | $ 0 | $ 0 |  |  | 0 |  |  |
Share-based compensation |  | $ 2,657 |  |  | 2,657 |  |  |
Shares issued in connection with the acquisition of Uranerz Energy Corporation (in shares) |  | 200,225 |  |  |  |  |  |
Shares issued in connection with the acquisition of Uranerz Energy Corporation | 539 | $ 539 |  |  | 539 |  |  |
Options issued in connection with the acquisition of Uranerz Energy Corporation (in shares) |  | 13,368,750 |  |  |  |  |  |
Options issued in connection with the acquisition of Uranerz Energy Corporation | 22,980 | $ 22,980 |  |  | 22,980 |  |  |
Stock Issuance Costs | $ (2,330) | $ (2,330) |  |  | (2,330) |  |  |
Sale of stock consideration received |  |  |  |  |  |  | 540 |
Share issued for property acquisitions (in shares) | 0 | 4,551,284 |  |  |  |  |  |
Share issued for property acquisitions | $ 2,679 | $ 2,679 |  |  | 2,679 |  |  |
Share issuance cost | (11,378) | $ (11,378) |  |  | (11,378) |  |  |
Contributions attributable to non-controlling interest | 37 |  |  |  |  | 37 |  |
Shares issued for acquisition of 40% Roca Honda (in shares) |  | 1,212,173 |  |  |  |  |  |
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 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss | (27,990) |  | (27,766) |  | (27,766) | (224) |  |
Other comprehensive income | $ (1,019) |  |  | (1,019) | (1,019) |  |  |
Shares issued for exercise of stock options (in shares) | 0 | 206,612 |  |  |  |  |  |
Shares issued for consulting services | $ 370 | $ 370 |  |  | 370 |  |  |
Shares issued for exercise of share purchase warrants (in shares) | 0 |  |  |  |  |  |  |
Share-based compensation | $ 3,525 | 3,525 |  |  | 3,525 |  |  |
Stock Issuance Costs | 394 | $ 394 |  |  | 394 |  |  |
Shares issued for cash by at-the-market offering (in shares) |  |  |  |  |  |  |  | 7,202,479
Sale of stock consideration received |  |  |  |  |  |  | $ 14,550 |
Shares issued for cash by at-the-market offering | $ 14,548 |  |  |  | 14,548 |  |  |
Share issued for property acquisitions (in shares) | 0 |  |  |  |  |  |  |
Contributions attributable to non-controlling interest | $ 365 |  |  |  |  | 365 |  |
Shares issued for public offering (in shares) |  | 752,580 |  |  |  |  |  |
Shares issued for the vesting of restricted stock units | 0 | $ 0 |  |  | 0 |  |  |
Shares issued for consulting services | 370 |  |  |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2017 |  | 74,366,824 |  |  |  |  |  |
Ending Balance at Dec. 31, 2017 | $ 127,268 | $ 430,383 | $ (309,287) | $ 2,289 | $ 123,385 | $ 3,883 |  |

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