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Investment in Unconsolidated Joint Venture (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Apr. 09, 2021
Mar. 31, 2021
Aug. 31, 2019
Schedule of Equity Method Investments [Line Items]              
Contribution made to the JV $ 0 $ 329 $ 4,000 $ 550      
Investment income (loss) from unconsolidated joint venture under the equity method of accounting $ 0 $ (8) $ 440 $ (39)      
Hi-Power              
Schedule of Equity Method Investments [Line Items]              
Percentage of voting interests acquired         51.00%    
Hi-Power              
Schedule of Equity Method Investments [Line Items]              
Initial estimated financial commitment             $ 4,100
Initial ownership interest         100.00% 49.00% 49.00%