Annual report pursuant to Section 13 and 15(d)

Contingencies and commitments - Capital Commitments (Details)

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Contingencies and commitments - Capital Commitments (Details) - Capital commitments - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Contingencies and commitments    
Committed amount   $ 18,132,000
Period in which commitments will be expected to incur (in years)   1 year
Committed amount expected to be paid in one year   $ 17,668,000
Committed amount expected to be paid in one to three years   $ 463,000
Maximum    
Contingencies and commitments    
Period in which commitments will be expected to incur (in years) 3 years