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3. Property, Plant and Equipment | 9 Months Ended
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Sep. 30, 2020
Property, Plant and Equipment [Abstract] |
3. Property, Plant and Equipment | Property, plant and equipment consist of the following:
|  | September 30, 2020 |  |  | December 31, 2019 |
Land |  | $ | 4,088 |  |  | $ | 4,104 |
Plant and buildings |  |  | 96,089 |  |  |  | 83,139 |
Furniture and fixtures |  |  | 1,166 |  |  |  | 1,094 |
Machinery and equipment |  |  | 4,389 |  |  |  | 4,252 |
Construction in progress |  |  | 18,612 |  |  |  | 12,571 |
Property held for development |  |  | 15,408 |  |  |  | 15,408 |
Finance lease right of use assets |  |  | 2,988 |  |  |  | - |
Total gross property, plant & equipment |  |  | 142,740 |  |  |  | 120,568 |
Less accumulated depreciation |  |  | (39,690 | ) |  |  | (36,342 | )
Total net property, plant & equipment |  | $ | 103,050 |  |  | $ | 84,226 |
Construction in progress contains incurred costs for the Biogas Project, Riverbank Project, and Zebrex equipment installation at the Keyes Plant. In the second quarter of 2020, CO2 Project commenced operations and was placed in service at that time. In the third quarter of 2020, two diary digesters commenced operations and were placed in service at that time. Depreciation on the components of property, plant and equipment is calculated using the straight-line method to allocate their depreciable amounts over their estimated useful lives as follows:
|  | Years |
Plant and buildings |  |  | 20 - 30 |
Machinery and equipment |  |  | 5 - 10 |
Furniture and fixtures |  |  | 3 - 5 |
For the three months ended September 30, 2020 and 2019, the Company recorded depreciation expense of $1.3 million and $1.1 million for each period. For the nine months ended September 30, 2020 and 2019, the Company recorded depreciation expense of $3.5 million and $3.3 million, respectively. Management is required to evaluate these long-lived assets for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. Management determined there was no impairment on the long-lived assets during the three and nine months ended September 30, 2020 and 2019.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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