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Condensed Consolidated Statement of Changes in Stockholders' Deficit - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands | Total | Preferred Shares | Common Shares | Treasury Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ (9,058) | $ 24,364 | $ 207,166 | $ (1,498) | $ 964,914 | $ (1,204,004)
Balance (in shares) at Dec. 31, 2016 |  | 328,184,640 | 270,183,201 | (819,505) |  |
Exercise of stock options | $ 451 |  | $ 164 |  | 287 |
Exercise of stock options (in shares) | 259,195 |  | 259,195 |  |  |
Vesting of restricted stock units | $ (2,593) |  | $ 1,312 | $ (2,556) | (1,349) |
Vesting of restricted stock units (in shares) |  |  | 2,088,249 | (833,911) |  |
Stock-based compensation | 10,491 |  |  |  | 10,491 |
Loss for the period | (45,400) |  |  |  |  | (45,400)
Balance at Sep. 30, 2017 | $ (46,109) | $ 24,364 | $ 208,642 | $ (4,054) | $ 974,343 | $ (1,249,404)
Balance (in shares) at Sep. 30, 2017 |  | 328,184,640 | 272,530,645 | (1,653,416) |  |

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