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Operating Expenses - Disclosure of auditor's remuneration (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Auditors Remuneration [Line Items]      
Audit of these financial statements $ 1,716,000 $ 1,183,000 $ 1,145,000
Audit of the financial statements of subsidiaries 132,000 312,000 291,000
Audit of financial statements of associates 814,000 571,000 350,000
Audit-related assurance services 1,157,000 1,868,000 490,000
Non-audit related services 0 0 173,000
Auditor's remuneration 3,819,000 3,934,000 2,449,000
Prepaid expenses for expected subsidiary IPO, audit related assurance services   468,200  
Gelesis      
Auditors Remuneration [Line Items]      
Audit of financial statements of associates $ 720,000 $ 500,000 $ 350,000