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Property, Plant, and Equipment | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Abstract] |  |
Property, Plant, and Equipment |
(4) | Property, Plant, and Equipment
Property, plant, and equipment consist of the following:
(in thousands) |  | March 31, 2018 |  |  | December 31, 2017 |
Buildings and land |  | $ | 579 |  |  | $ | 579 |
Enterprise hardware and software |  |  | 1,746 |  |  |  | 1,744 |
Leaseholds |  |  | 1,719 |  |  |  | 1,705 |
Equipment |  |  | 971 |  |  |  | 971 |
Furniture |  |  | 176 |  |  |  | 175 |
Property, plant and equipment, gross |  |  | 5,191 |  |  |  | 5,174 |
Accumulated depreciation |  |  | (4,003 | ) |  |  | (3,876 | )
Property, plant and equipment, net |  | $ | 1,188 |  |  | $ | 1,298 |
Depreciation expense for the three months ended March 31, 2018 was approximately $0.1 million, as compared to approximately $0.1 million for the same period in 2017. |
(6) | Property, Plant, and Equipment
Property, plant, and equipment consists of:
(in thousands) |  | December 31, 2017 |  |  | December 31, 2016 |
Buildings and land |  | $ | 579 |  |  | $ | 556 |
Enterprise hardware and software |  |  | 1,744 |  |  |  | 1,532 |
Leaseholds |  |  | 1,705 |  |  |  | 1,504 |
Equipment |  |  | 971 |  |  |  | 940 |
Furniture |  |  | 175 |  |  |  | 354 |
Property, plant and equipment, gross |  |  | 5,174 |  |  |  | 4,886 |
Accumulated depreciation |  |  | (3,876 | ) |  |  | (3,803 | )
Property, plant and equipment, net |  | $ | 1,298 |  |  | $ | 1,083 |
Depreciation expense for the years ended December 31, 2017, 2016 and 2015 was $0.3 million, $0.3 million, $0.6 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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