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Share Capital - Schedule of Share Capital (Detail) - shares | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Class of Stock [Line Items] |  |
Registered share capital | 71,633,951 | 61,036,566
Authorized share capital | 115,172,786 | 103,901,006
Employee Benefit Plans [Member] |  |
Class of Stock [Line Items] |  |
Conditional share capital - Bonds or similar debt instruments | 17,493,709 | 18,698,237
Bonds or Similar Debt Instruments [Member] |  |
Class of Stock [Line Items] |  |
Conditional share capital - Bonds or similar debt instruments | 4,919,700 | 4,919,700
Swiss Law [Member] |  |
Class of Stock [Line Items] |  |
Authorized share capital | 21,125,426 | 19,246,503

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