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Property and Equipment | 12 Months Ended
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Dec. 31, 2018
Property Plant And Equipment [Abstract] |
Property and Equipment | 4. Property and Equipment Property and equipment consist of the following (in thousands):
|  | Estimated Useful |  |  | December 31, |
|  | Life (Years) |  |  | 2018 |  |  | 2017 |
Land |  |  | — |  |  | $ | 875 |  |  | $ | 875 |
Buildings |  | 39-40 |  |  |  | 17,389 |  |  |  | 17,389 |
Building improvements |  | 5-40 |  |  |  | 34,967 |  |  |  | 34,957 |
Machinery and equipment |  | 3-15 |  |  |  | 61,217 |  |  |  | 62,681 |
Furniture, fixtures and office equipment |  | 5-10 |  |  |  | 2,954 |  |  |  | 3,556 |
Computer equipment and software |  |  | 3 |  |  |  | 8,355 |  |  |  | 8,416 |
Construction in progress |  |  | — |  |  |  | 342 |  |  |  | — |
|  |  |  |  |  |  | 126,099 |  |  |  | 127,874 |
Less accumulated depreciation |  |  |  |  |  |  | (100,497 | ) |  |  | (100,952 | )
Total property and equipment, net |  |  |  |  |  | $ | 25,602 |  |  | $ | 26,922 |
Depreciation expense related to property and equipment for the years ended December 31, 2018, 2017 and 2016, was $1.7 million, $1.8 million and $2.4 million, respectively. The Company disposed of $2.1 million of furniture and fixtures, manufacturing equipment and laboratory equipment as it was no longer in service. The net book value was de minimis. On January 6, 2017, the Company and Rexford Industrial Realty, L.P. (“Rexford”) entered into an Agreement of Purchase and Sale and Joint Escrow Instructions (the “Purchase Agreement”), pursuant to which the Company agreed to sell and Rexford agreed to purchase certain parcels of real estate owned by the Company in Valencia, California and certain related improvements, personal property, equipment, supplies and fixtures (collectively, the “Property”) for $17.3 million. This asset in the amount of $16.7 million was classified as held for sale as of December 31, 2016. The sale and purchase of the Property for $17.3 million pursuant to the terms of the Purchase Agreement, as amended, was completed on February 17, 2017. Net proceeds were $16.7 million after deducting broker’s commission and other fees of approximately $0.6 million paid by the Company. Net proceeds received approximated the carrying value of the asset held for sale.

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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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