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Property and Equipment, Net | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Property and Equipment, Net |  |
Property and Equipment, Net | 5. Property and Equipment, Net Property and equipment consist of the following (in thousands):
|  | September 30, |  | December 31,
|  | 2019 |  | 2018
Research equipment |  | $ | 9,746 |  | $ | 7,787
Leasehold improvements |  |  | 5,365 |  |  | 4,825
Computer equipment |  |  | 441 |  |  | 167
Furniture and fixtures |  |  | 94 |  |  | 70
Construction in progress |  |  | 787 |  |  | 1,027
Property and equipment, gross |  |  | 16,433 |  |  | 13,876
Less: accumulated depreciation and amortization |  |  | (4,402) |  |  | (2,469)
Property and equipment, net |  | $ | 12,031 |  | $ | 11,407
Construction in progress at September 30, 2019 consists of the costs incurred for research equipment and for the build-out of additional lab and office space and at December 31, 2018 consists of the costs incurred for the build-out of a manufacturing suite at the Company’s headquarters in Beltsville, Maryland. Depreciation and amortization expense was $788,000 and $1,933,000 for the three and nine months ended September 30, 2019, respectively, and $396,000 and $1,159,000 for the three and nine months ended September 30, 2018, respectively. | 4. Property and Equipment, Net Property and equipment consist of the following (in thousands):
|  | December 31,
|  | 2018 |  | 2017
Research equipment |  | $ | 7,787 |  | $ | 6,213
Leasehold improvements |  |  | 4,825 |  |  | 564
Computer equipment |  |  | 167 |  |  | 111
Furniture and fixtures |  |  | 70 |  |  | 33
Construction in progress |  |  | 1,027 |  |  | 3,892
Property and equipment, gross |  |  | 13,876 |  |  | 10,813
Less: accumulated depreciation and amortization |  |  | (2,469) |  |  | (792)
Property and equipment, net |  | $ | 11,407 |  | $ | 10,021
Construction in progress at December 31, 2018 consists of the costs incurred for research equipment. Depreciation and amortization expense was $1.7 million and $582,000 for the years ended December 31, 2018 and 2017, respectively.

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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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