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Earnings per Share | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share The Company applies the two-class method to calculate its basic and diluted net loss per share as both classes of its voting shares are participating securities with equal participation rights and are entitled to receive dividends on a share for share basis. The following table summarizes the reconciliation of the basic weighted average number of shares outstanding and the diluted weighted average number of shares outstanding.
| Years ended
| December 31, 2015 |  | December 31, 2014 |  | December 31, 2013
Basic and diluted weighted average number of shares outstanding | 61,716,065 |  |  | 38,940,252 |  |  | 37,248,710
The following items have been excluded from the diluted weighted average number of shares outstanding because they are anti-dilutive: |  |  |  |  |
Stock options | 11,204,026 |  |  | 15,031,388 |  |  | 12,737,893
Restricted share units | 428,566 |  |  | — |  |  | — |
Restricted shares | 48,238 |  |  | 148,314 |  |  | 589,990
Convertible preferred shares | — |  |  | 27,159,277 |  |  | 27,159,277 |
| 11,680,830 |  |  | 42,338,979 |  |  | 40,487,160
In the years ended December 31, 2015, 2014, and 2013 the Company was in a loss position and therefore diluted loss per share is equal to basic loss per share.

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