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Long-term debt (Details) - USD ($) $ in Millions				3 Months Ended		6 Months Ended
	Apr. 01, 2024	Apr. 01, 2023	Jan. 29, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
2021 Amended Facility
Long-term Debt
Proceed from drew down			$ 35.0
2018 and 2021 Amended Facility
Long-term Debt
Foreign currency loss				$ 6.3		$ 8.4	$ 2.2
Foreign currency gain					$ 0.9
Interest expense recorded					$ 1.8	5.0	$ 3.4
Restated Facility 2021
Long-term Debt
Outstanding debt				$ 100.0		100.0
Proceed from drew down						$ 30.0
Interest rate (as a percent)				7.95%		7.95%
Back-end fee (as a percent)						4.85%
Back-end fees due				$ 2.5		$ 2.5
Amortized cost net of discount and debt issuance costs				102.6		102.6		$ 101.6
Interest expense recorded				2.6
Restated Facility 2021 | Tranche One
Long-term Debt
Outstanding debt				$ 70.0		$ 70.0
Restated Facility 2021 | Prime Rate
Long-term Debt
Variable interest rate basis						7.95%
Discount rate (as a percent)				3.25%		3.25%
Venture debt loan facility | Restated Facility 2021
Long-term Debt
Minimum cash and cash equivalents in U.S. bank accounts						65.00%	100.00%
Assets pledged to secure facilities by directly or indirectly						$ 701.2
Assets not being pledged to secure facilities by directly or indirectly						89.2
Venture debt loan facility | Restated Facility 2021 | Corlieve Therapeutics SAS
Long-term Debt
Assets not being pledged to secure facilities by directly or indirectly						$ 85.1
Subsequent events. | Venture debt loan facility | Restated Facility 2021
Long-term Debt
Minimum cash and cash equivalents in U.S. bank accounts	30.00%	50.00%

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The back-end fee, expressed as a percentage of outstanding loan amount.

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Contractual discount rate for interest rate under the debt agreement.

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Debt covenant that specifies cash and cash equivalents of a minimum of 65% of the outstanding balance of principal due under Credit Facility are to be held in U.S. bank accounts.

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