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Summary of Significant Accounting Policies - Exchange rates (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Euro to US Dollar        
Period end exchange rate 1.13 1.23 1.19 1.12
Average period exchange rate 1.17 1.17 1.19 1.11
Mexican Peso to US Dollar        
Period end exchange rate 0.05 0.05 0.05 0.04
Average period exchange rate 0.05 0.05 0.05 0.05