Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Energy Assets (Details)

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Summary of Significant Accounting Policies - Energy Assets (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Revenue, Major Customer [Line Items]    
Grant proceeds $ 0 $ 774,000
Deferred grant income 7,617,000 6,481,000
United States    
Revenue, Major Customer [Line Items]    
Deferred grant income $ 7,590,000 $ 8,498,000