The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

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Share-based compensation - Narrative (Details) SFr / shares in Units, SFr in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2022 CHF (SFr) SFr / shares shares	Dec. 31, 2022 $ / shares	Dec. 31, 2021 CHF (SFr) employee SFr / shares shares	Dec. 31, 2021 employee $ / shares	Dec. 31, 2020 CHF (SFr)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation \| SFr			SFr 38,300		SFr 183,200		SFr 77,700
Expense from equity-settled share-based payment transactions \| SFr			SFr 33,800		SFr 198,500
Average expected fluctuation in expense recognition	10.00%	7.50%
LTIP 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]
Accelerated vesting percentage			100.00%
Number of share options granted before capital reorganization (in shares) \| shares			1
Number of share options, adjusted after capital reorganization (in shares) \| shares			1,250
LTIP 2018 \| Exercise price range 1
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price, share options granted before capital reorganization (in CHF per share) \| SFr / shares			SFr 10
Exercise price, share options granted (in USD per share)				$ 0.11
LTIP 2018 \| Exercise price range 2
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price, share options granted before capital reorganization (in CHF per share) \| SFr / shares			4,557
Exercise price, share options granted (in USD per share)				3.96
LTIP 2018 \| Exercise price range 3
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price, share options granted before capital reorganization (in CHF per share) \| SFr / shares			SFr 9,125
Exercise price, share options granted (in USD per share)				$ 7.93
LTIP 2018 \| RSUs \| Fifth anniversary of the granting date
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage			20.00%
LTIP 2020
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of share options granted before capital reorganization (in shares) \| shares					1
Number of share options, adjusted after capital reorganization (in shares) \| shares					1,250
Vesting period					75 days
LTIP 2020 \| Acceleration of option grant 2022/2023 and 2024, previous participants
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price, share options granted (in USD per share)						$ 7.73
LTIP 2020 \| Acceleration of option grant 2022/2023, participants who joined in 2021, before 1 July 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price, share options granted (in USD per share)						12.36
LTIP 2020 \| Acceleration of option grant 2024, participants who joined in 2021, before 1 July 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price, share options granted (in USD per share)						$ 11.33
LTIP 2020 \| USD to CHF
Disclosure of terms and conditions of share-based payment arrangement [line items]
Closing foreign exchange rate \| employee					0.92	0.92
LTIP 2020 \| Exercise price range 1
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price, share options granted before capital reorganization (in CHF per share) \| SFr / shares					SFr 8,884
Exercise price, share options granted (in USD per share)						$ 7.73
LTIP 2020 \| Exercise price range 2
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price, share options granted before capital reorganization (in CHF per share) \| SFr / shares					SFr 9,125
Exercise price, share options granted (in USD per share)						$ 7.93
LTIP 2020 \| RSUs \| Seventh anniversary of the granting date
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage			14.29%
LTIP 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting requirements for share-based payment arrangement, performance cycle			3 years
LTIP 2021 \| RSUs \| Granting date
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage			33.33%
LTIP 2021 \| RSUs \| First anniversary of granting date
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage			33.33%
LTIP 2021 \| RSUs \| Second anniversary of granting date
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage			33.33%
LTIP 2021 \| PSUs \| Third anniversary of the granting date
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage			100.00%
Founders' Plan 2021 \| RSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Value of share options granted \| SFr					SFr 8
Period Of Continued Employment					6 months
Number Of Days After IPO When RSUs Were Granted					75 days
LTPP 2018 \| RSUs \| Third anniversary of the granting date
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage			33.33%
LTPP 2018 \| RSUs \| Tenth anniversary of the granting date
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage			10.00%