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Net Loss per Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Net Loss per Share | Net Loss 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:
| December 31, 2018 |  | December 31, 2017
Basic and diluted weighted average number of shares outstanding | 105,671,839 |  |  | 95,774,897 |
The following items have been excluded from the diluted weighted average number of shares outstanding because they are anti-dilutive: |  |  |  |
Stock options | 5,476,790 |  |  | 7,353,546 |
Restricted share units | 2,473,665 |  |  | 2,498,678 |
| 7,950,455 |  |  | 9,852,224 |
In the years ended December 31, 2018 and 2017, the Company was in a loss position and therefore diluted loss per share is equal to basic loss per share.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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