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Property and Equipment, Net | 9 Months Ended
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Sep. 30, 2019
Property, Plant and Equipment [Abstract] |
Property and equipment, net | Property and Equipment, net Property and equipment, net, consisted of the following (in thousands):
Asset Class |  | Useful Life (Years) |  | September 30, 2019 |  | December 31, 2018
Operational equipment |  | 3-10 |  | $ | 21,461 |  |  | $ | 15,926 |
Lab equipment |  | 5 |  | 580 |  |  | 698 |
Computer equipment |  | 3 |  | 221 |  |  | 201 |
Office furniture and equipment |  | 3 |  | 353 |  |  | 336 |
Land |  | - |  | 1,047 |  |  | 1,047 |
Building |  | 39 |  | 24,867 |  |  | 24,820 |
Asset retirement cost |  | 20 |  | 670 |  |  | 670 |
Equipment under construction |  |  |  | 11,087 |  |  | 7,892 |
|  |  |  | 60,286 |  |  | 51,590 |
Less: accumulated depreciation |  |  |  | (8,637 | ) |  | (6,042 | )
Total property and equipment, net |  |  |  | $ | 51,649 |  |  | $ | 45,548 |
Depreciation expense was $0.9 million and $2.7 million for the three and nine months ended September 30, 2019, respectively, and $0.8 million and $2.4 million for the three and nine months ended September 30, 2018, respectively. Equipment under construction is primarily AquaRefining modules manufactured by the Company to be used in the McCarran, Nevada recycling plant.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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