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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment | Property, plant and equipment consist of the following (in thousands):
|  | December 31, 2017 |  |  | December 31, 2016 |
Land |  | $ | 1,023 |  |  | $ | — |
Buildings |  |  | 764 |  |  |  | — |
Leasehold improvements |  |  | 15,673 |  |  |  | 14,592 |
Equipment |  |  | 21,904 |  |  |  | 15,214 |
Furniture and fixtures |  |  | 4,272 |  |  |  | 3,218 |
Construction in progress |  |  | 2,581 |  |  |  | 1,264 |
Total property, plant and equipment |  |  | 46,217 |  |  |  | 34,288 |
Less: accumulated depreciation |  |  | (23,800 | ) |  |  | (19,332 | )
Property, plant and equipment, net |  | $ | 22,417 |  |  | $ | 14,956 |
Estimated Useful Life |
Property, Plant and Equipment | Depreciation is calculated using the straight-line method over the estimated useful life of the asset as follows:
Classification |  | Estimated Useful Life
Buildings |  | Thirty years
Leasehold improvements |  | Shorter of the term of the lease or estimated useful life
Equipment |  | Three to twelve years
Furniture and fixtures |  | Three to eight years

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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