Accounting Principles Applied in the Preparation of the Consolidated Financial Statements - Summary of Geographical Analysis of Assets (Detail) - USD ($) $ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Disclosure Of Geographical Areas [Line Items] | ||
| Total non-current assets | $ 25,474 | $ 28,479 |
| Switzerland [Member] | ||
| Disclosure Of Geographical Areas [Line Items] | ||
| Total non-current assets | 25,385 | 27,936 |
| USA [Member] | ||
| Disclosure Of Geographical Areas [Line Items] | ||
| Total non-current assets | $ 89 | $ 543 |