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Loss before taxation - Other items (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other items      
Cost of inventories (note 16) $ 57,442,036 $ 52,701,330 $ 10,412,753
Depreciation of (note 11)      
- property, plant and equipment# 3,899,721 2,745,549 708,637
- right-of-use assets# 2,087,167 1,542,566 583,835
Amortization of intangible assets# (note 12) 1,556,091 3,058,527 1,133,564
Restructuring costs in relation to diagnostic business 30,378,741 0 0
Write-off on property, plant and equipment 268,226 476,431  
Auditor's remuneration 1,439,617 1,221,439 566,553
Miscellaneous laboratory charges 268 13,953 12,892
impairment of intangible assets [Member]      
Depreciation of (note 11)      
Restructuring costs in relation to diagnostic business 19,109,580 0 0
impairment of goodwill [Member]      
Depreciation of (note 11)      
Restructuring costs in relation to diagnostic business 3,272,253 0 0
impairment losses on property, plant and equipment [Member]      
Depreciation of (note 11)      
Restructuring costs in relation to diagnostic business 4,447,610 0 0
write-off of prepayment [Member]      
Depreciation of (note 11)      
Restructuring costs in relation to diagnostic business 3,549,298 0 0
Direct costs      
Depreciation of (note 11)      
Total depreciation and amortization charges 1,892,036 1,182,134 462,809
Research and development expenses      
Depreciation of (note 11)      
Total depreciation and amortization charges 340,690 145,876 63,162
Administrative and other operating expenses      
Depreciation of (note 11)      
Total depreciation and amortization charges 5,310,253 6,018,632 1,900,065
Total Depreciation And Amortization Charges [Member]      
Depreciation of (note 11)      
Total depreciation and amortization charges $ 7,542,979 $ 7,346,642 $ 2,426,036