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Share Capital - Schedule of Share Capital (Detail) - shares | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Class of Stock [Line Items] |  |
Registered share capital | 80,321,227 | 75,133,951
Authorized share capital | 115,172,786 | 115,172,786
Employee Benefit Plans [Member] |  |
Class of Stock [Line Items] |  |
Conditional share capital - Bonds or similar debt instruments | 15,806,433 | 17,493,709
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 | 14,125,426 | 17,625,426

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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