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Net Loss per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Summary of the Reconciliation of the Basic and Diluted Weighted Average Number of Shares Outstanding | 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 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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