Portfolio Financings - Schedule of VIEs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) MMBTU	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
PPA Company 3a
Variable Interest Entity [Line Items]
Maximum size of installation (in megawatts) | MMBTU	10
Installed size (in megawatts) | MMBTU	10
Term of power purchase agreements (in years)	15 years
Income (loss) and tax benefits allocation to Equity Investor	99.00%
Cash allocation to Equity Investor	99.00%
Income (loss), tax and cash allocations to Equity Investor after the flip date	5.00%
Company cash contributions	$ 32,223
Company non-cash contributions	8,655
Equity Investor cash contributions	36,967
Debt financing	44,968
Accrued distributions to equity investors	4,897	$ 4,847	$ 4,803
Debt repayment—principal	$ 13,899	10,513	6,631
PPA Company 4
Variable Interest Entity [Line Items]
Maximum size of installation (in megawatts) | MMBTU	21
Installed size (in megawatts) | MMBTU	19
Term of power purchase agreements (in years)	15 years
Income (loss) and tax benefits allocation to Equity Investor	90.00%
Cash allocation to Equity Investor	90.00%
Company cash contributions	$ 11,669
Company non-cash contributions	0
Equity Investor cash contributions	84,782
Debt financing	99,000
Accrued distributions to equity investors	12,848	8,852	6,692
Debt repayment—principal	$ 25,045	21,163	18,012
PPA Company 5
Variable Interest Entity [Line Items]
Maximum size of installation (in megawatts) | MMBTU	40
Installed size (in megawatts) | MMBTU	37
Term of power purchase agreements (in years)	15 years
Income (loss) and tax benefits allocation to Equity Investor	99.00%
Cash allocation to Equity Investor	90.00%
Company cash contributions	$ 27,932
Company non-cash contributions	0
Equity Investor cash contributions	227,344
Debt financing	131,237
Accrued distributions to equity investors	26,601	24,809	70,591
Debt repayment—principal	$ 132,587	$ 16,475	$ 9,453