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FIXED ASSETS | 6 Months Ended
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Jun. 30, 2018
Property, Plant and Equipment [Abstract] |
FIXED ASSETS | FIXED ASSETS Fixed assets, summarized by major category, consist of the following (in thousands):
| June 30, |  | December 31,
| 2018 |  | 2017
Machinery and laboratory equipment | $ | 41,809 |  |  | $ | 39,002 |
Leasehold improvements | 34,932 |  |  | 34,933 |
Computer equipment and software | 7,448 |  |  | 7,086 |
Office furniture and equipment | 1,420 |  |  | 1,603 |
Construction in progress | 79,670 |  |  | 73,632 |
Total | 165,279 |  |  | 156,256 |
Less: accumulated depreciation | (54,003 | ) |  | (49,210 | )
Fixed assets, net | $ | 111,276 |  |  | $ | 107,046 |
For the three months ended June 30, 2018 and 2017, depreciation expense was $2.8 million and $3.7 million, respectively. For each of the three and six month periods ended June 30, 2018 and 2017, capitalized interest on the construction of manufacturing sites was $0.2 million. For the six months ended June 30, 2018 and 2017, depreciation expense was $5.6 million and $6.8 million, respectively. For the six months ended June 30, 2018 and 2017, capitalized interest on the construction of manufacturing sites was $0.6 million and $0.4 million, respectively. At June 30, 2018 and December 31, 2017, total fixed assets, net, includes leasehold improvements and manufacturing process equipment located in England in the amount of $65.2 million and $59.8 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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