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Stock options - Subsequent Event (Details) - Subsequent Event [Member]
$ / shares in Units, $ in Millions
Mar. 10, 2022
USD ($)
$ / shares
shares
Restricted Stock [Member] | Employee [Member]  
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Intrinsic Value | $ $ 4.0
Debt term 10 years
exercise price | $ / shares $ 4.99
Employee Stock Option [Member] | Chief Executive Officer [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 1,359,558