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Summary of Significant Accounting Policies - Sales Leaseback (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2018 USD ($) project | Dec. 31, 2018 USD ($) project | Dec. 31, 2017 USD ($) project | Dec. 31, 2016 USD ($) project | Sep. 30, 2016 USD ($)
Sale Leaseback Transaction [Line Items] |  |  |  |  |
Capital lease assets, net |  | $ 6,985,000 | $ 5,303,000 |  |
Deferred Gain Recorded |  | 6,153,000 | 6,173,000 |  |
Deferred Loss Recorded |  | $ 2,032,000 | $ 2,172,000 |  |
Solar PV project |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |
Maximum combined funding amount | $ 100,000,000 |  |  |  | $ 100,000,000
Number of projects sold then leased back to separate investor | project | 2 |  | 1 |  |
Number of Solar PV Projects Sold | project |  | 2 | 13 | 6 |
Sale Price |  | $ 5,145,000 | $ 51,204,000 | $ 17,045,000 |
Deferred Gain Recorded |  | 574,000 | 4,625,000 | 906,000 |
Deferred Loss Recorded |  | 0 | 1,204,000 | 145,000 |
Capital Lease Asset/Liability Recorded |  | $ 2,625,000 | 22,934,000 | $ 8,830,000 |
Percentage of fair value threshold integral equipment |  | 10.00% |  |  |
Net amortization expense (gains) |  | $ 213,000 | $ (79,000) |  |
Solar PV project | Minimum |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |
Initial Lease Term (years) |  |  | 10 years | 20 years |
Lease payment |  | $ 3,000 | $ 4,000 | $ 2,000 |
Solar PV project | Maximum |  |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |  |
Initial Lease Term (years) |  | 20 years | 20 years | 25 years |
Lease payment |  | $ 144,000 | $ 510,000 | $ 397,000 |

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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