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Property, Equipment and Software | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Equipment and Software | Property, Equipment and Software Property, equipment and software consists of the following (in thousands):
| December 31,
| 2017 |  | 2016
Computer equipment | $ | 2,261 |  |  | $ | 2,520 |
Software | 5,111 |  |  | 2,352 |
Furniture and office equipment | 656 |  |  | 897 |
Lab equipment | 20,549 |  |  | 20,208 |
Leasehold improvements | 17,525 |  |  | 17,807 |
Construction in progress | 32,800 |  |  | — |
Property, equipment and software | 78,902 |  |  | 43,784 |
Less accumulated depreciation and amortization | (28,919 | ) |  | (25,823 | )
Property, equipment and software, net | $ | 49,983 |  |  | $ | 17,961 |
Construction in progress at December 31, 2017 consists of the costs incurred for the build-out of a manufacturing suite at our headquarters building in Rockville, Maryland, which is expected to be completed in mid-2018. We had $9.6 million in property, equipment and software at December 31, 2017 that was purchased in 2017 but was not paid for by year end. Property, equipment and software balance at December 31, 2016 includes approximately $0.3 million in assets that were purchased in 2016 but were not paid for by year end. Depreciation and amortization expense related to property, equipment and software for the years ended December 31, 2017, 2016 and 2015 was $7.0 million, $6.8 million and $3.2 million, 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://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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