Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Project Development Costs?? (Details)

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Summary of Significant Accounting Policies - Project Development Costs  (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Product development cost included in other long-term assets $ 2,217 $ 1,543