Income Taxes and Deferred Taxes - Additional Information (Detail) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Disclosure of Income Tax [Abstract] | |||
| Statutory tax rate (blended at Group level) | 8.50% | 7.90% | |
| ObsEva Ireland Ltd [Member] | |||
| Disclosure of Income Tax [Abstract] | |||
| Current tax expense (income) | $ 0 | $ 0 | |
| ObsEva USA Inc [Member] | |||
| Disclosure of Income Tax [Abstract] | |||
| Statutory tax rate (blended at Group level) | 27.30% | 27.30% | |
| Current tax expense (income) | $ 212,000 | $ 34,000 | |
| Deferred taxes | $ 0 | 0 | |
| Switzerland [Member] | |||
| Disclosure of Income Tax [Abstract] | |||
| Tax loss carryforward period | 7 years | ||
| Current tax expense (income) | 0 | $ 0 | |
| Deferred taxes | $ 0 | $ 0 | |
| Switzerland [Member] | Municipal and Cantonal Tax Rate [Member] | |||
| Disclosure of Income Tax [Abstract] | |||
| Statutory tax rate (blended at Group level) | 14.00% | 14.00% | |
| Switzerland [Member] | Federal Tax Rate [Member] | |||
| Disclosure of Income Tax [Abstract] | |||
| Statutory tax rate (blended at Group level) | 8.50% | 8.50% | |