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Fixed assets | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
Fixed assets | Fixed assets Fixed assets, net were as follows at December 31, 2019 and 2018:
|  | December 31,
|  | 2019 |  | 2018
Leasehold improvements |  | $ | 5,039 |  |  | $ | 2,384 |
Computer equipment and software |  | 8,069 |  |  | 4,609 |
Furniture, fixtures, machinery and lab equipment |  | 17,033 |  |  | 9,965 |
Assets in process |  | 3,232 |  |  | 3,219 |
|  | 33,373 |  |  | 20,177 |
Less accumulated depreciation and amortization |  | (11,824 | ) |  | (7,483 | )
Total |  | $ | 21,549 |  |  | $ | 12,694 |
Depreciation expense was approximately $4.7 million, $2.6 million, and $2.3 million for the years ended December 31, 2019, 2018, and 2017, 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://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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