Annual report pursuant to Section 13 and 15(d)

Income taxes - Change in Valuation Allowance (Details)

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Income taxes - Change in Valuation Allowance (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Valuation allowance, beginning $ 82,398,000  
Foreign currency translation adjustments (1,513,000) $ 2,897,000
Valuation allowance, ending 132,443,000 82,398,000
Net loss    
Increase in valuation allowance through net loss 50,046,000 23,025,000
Other comprehensive loss    
Increase/(decrease) in valuation allowance through other comprehensive loss 1,512,000 (2,696,000)
Previously Reported    
Valuation allowance, beginning $ 82,398,000 59,172,000
Valuation allowance, ending   $ 82,398,000