Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Income taxes (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Income taxes (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basis of Presentation and Summary of Significant Accounting Policies      
Corporate tax rate 21.00% 21.00% 21.00%