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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure Of Commitments And Contingent Liabilities [abstract]  
Disclosure of quantities available to supply by fiscal period

 

YearCommitment
2020350 kilograms
2021650 kilograms
20221,000 kilograms
20231,000 kilograms
20241,000 kilograms