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Leases - Additional Information (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
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Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) project | Jun. 30, 2020 USD ($) | Jul. 31, 2021 USD ($) | Mar. 22, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Commitment, amount | $ 3,000,000 |  | $ 3,000,000 |  |  |  |  |
Maximum combined funding amount |  |  |  |  |  | $ 350,000,000 | $ 4,500,000 | $ 150,000,000
Net amortization expense | 57,000 | $ 57,000 | $ 114,000 | $ 112,000 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Maximum combined funding amount |  |  |  |  | $ 23,559,000 |  |  |
Solar Photovoltaic Projects |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Solar PV projects sold | project |  |  | 2 |  |  |  |  |
Proceeds from sale-leaseback financings |  |  | $ 26,820,000 |  |  |  |  |
Solar Photovoltaic Projects | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Available funding under lending commitment | $ 284,885,000 |  | $ 284,885,000 |  |  |  |  |

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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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