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Income tax Income tax (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Deferred Tax Assets, Operating Loss Carryforwards, Domestic $ 88,000,000 $ 77,000,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 0  
Deferred Tax Assets, Other Tax Carryforwards $ 9,000,000