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Property, Plant, and Equipment | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Property Plant And Equipment [Abstract] |  |
Property, Plant, and Equipment |
(5) | PROPERTY, PLANT, AND EQUIPMENT
Property, plant, and equipment consist of the following:
(in thousands) |  | September 30, 2019 |  |  | December 31, 2018 |  |  | Estimated Useful Life |
Buildings and land |  | $ | 589 |  |  | $ | 589 |  |  |  | 30 years - Buildings |
Enterprise hardware and software |  |  | 1,739 |  |  |  | 1,742 |  |  |  | 3 years |
Leaseholds |  |  | 1,687 |  |  |  | 1,701 |  |  |  | Lesser of lease term or estimated useful life |
Equipment |  |  | 1,002 |  |  |  | 1,002 |  |  |  | 7 years |
Furniture |  |  | 197 |  |  |  | 198 |  |  |  | 5 years |
Property, plant and equipment, gross |  |  | 5,214 |  |  |  | 5,232 |  |  |  |  |
Accumulated depreciation |  |  | (4,458 | ) |  |  | (4,307 | ) |  |  |  |
Property, plant and equipment, net |  | $ | 756 |  |  | $ | 925 |  |  |  |  |
Depreciation expense for the three and nine months ended September 30, 2019 was approximately $0.1 million and $0.2 million, respectively as compared to approximately $0.1 million and $0.3 million, respectively, for the same periods in 2018. |
(7) | PROPERTY, PLANT, AND EQUIPMENT
Property, plant, and equipment consists of:
(in thousands) |  | December 31, 2018 |  |  | December 31, 2017 |  |  | Estimated Useful Life |
Buildings and land |  | $ | 589 |  |  | $ | 579 |  |  |  | 30 years-Buildings |
Enterprise hardware and software |  |  | 1,742 |  |  |  | 1,744 |  |  |  | 3 years |
Leaseholds |  |  | 1,701 |  |  |  | 1,705 |  |  |  | Lesser of lease term or estimated useful life |
Equipment |  |  | 1,002 |  |  |  | 971 |  |  |  | 7 years |
Furniture |  |  | 198 |  |  |  | 175 |  |  |  | 5 years |
Property, plant and equipment, gross |  |  | 5,232 |  |  |  | 5,174 |  |  |  |  |
Accumulated depreciation |  |  | (4,307 | ) |  |  | (3,876 | ) |  |  |  |
Property, plant and equipment, net |  | $ | 925 |  |  | $ | 1,298 |  |  |  |  |
Depreciation expense for the years ended December 31, 2018 and 2017 was $0.4 million, $0.3 million, respectively.

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- References No definition available. + Details
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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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