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Shareholders' Equity - Summary of Number of Share Options Outstanding (Detail) - shares | Jun. 30, 2019 | Dec. 31, 2018
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Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding share options | 3,282,510 | 2,633,039
Key management personnel [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding share options | 2,580,281 |
All other employees [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding share options | 702,229 |

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