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Investment in unconsolidated joint venture (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Apr. 09, 2021
Apr. 08, 2021
Aug. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Contribution made to the JV $ 0 $ 4,000      
Investment income (loss) from unconsolidated joint venture under the equity method of accounting $ 0 $ 440      
Hi-Power          
Schedule of Equity Method Investments [Line Items]          
Percentage of voting interests acquired 51.00%   51.00% 51.00%  
Hi-Power          
Schedule of Equity Method Investments [Line Items]          
Initial estimated financial commitment         $ 4,100
Initial ownership interest 49.00%   100.00% 49.00% 49.00%