Financial Instruments and Risks - Sensitivity of Loss Before Tax To Changes in Foreign Exchange Rates (Parenthetical) (Detail) - Functional Currency	12 Months Ended
	Dec. 31, 2021
USD/CHF
Disclosure Of Effect Of Changes In Foreign Exchange Rates [Line Items]
Percentage of foreign exchange rates	10.00%
EUR/CHF
Disclosure Of Effect Of Changes In Foreign Exchange Rates [Line Items]
Percentage of foreign exchange rates	10.00%
GBP/CHF
Disclosure Of Effect Of Changes In Foreign Exchange Rates [Line Items]
Percentage of foreign exchange rates	10.00%
USD/EUR
Disclosure Of Effect Of Changes In Foreign Exchange Rates [Line Items]
Percentage of foreign exchange rates	10.00%