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Leases - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) project | Sep. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Jul. 31, 2021 USD ($) | Mar. 22, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Commitment, amount | $ 3,320,000 |  | $ 3,320,000 |  |  |  |  |  |
Net amortization expense | 57,000 | $ 57,000 | $ 172,000 | $ 170,000 |  |  |  |  |
August 2018 Long Term Finance Liability |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Maximum combined funding amount |  |  |  |  |  |  | $ 350,000,000 |  | $ 150,000,000
December 2020 Long Term Finance Liability |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Maximum combined funding amount |  |  |  |  |  | $ 23,559,000 |  | $ 4,500,000 |
Solar Photovoltaic Projects | August 2018 Long Term Finance Liability |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Solar PV projects sold | project |  |  | 3 |  |  |  |  |  |
Investment fund call option exercise |  |  | $ 31,095,000 |  |  |  |  |  |
Solar Photovoltaic Projects | December 2020 Long Term Finance Liability |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Solar PV projects sold | project |  |  | 1 |  |  |  |  |  |
Investment fund call option exercise |  |  | $ 3,281,000 |  |  |  |  |  |
Solar Photovoltaic Projects | Revolving Credit Facility | Line of Credit | August 2018 Long Term Finance Liability |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Available funding under lending commitment | 280,610,000 |  | 280,610,000 |  |  |  |  |  |
Solar Photovoltaic Projects | Revolving Credit Facility | Line of Credit | December 2020 Long Term Finance Liability |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Available funding under lending commitment | $ 15,936,000 |  | $ 15,936,000 |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |
Commitment, amount |  |  |  |  | $ 3,000,000 |  |  |  |

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- Definition Amount of short-term lease commitment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918705-209980 + Details
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