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Fixed Assets | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Fixed Assets | Fixed Assets Fixed assets at December 31, 2020 and 2019 consisted of the following:
| Cost |  | Accumulated Depreciation and Amortization |  | Net Book Value
As of December 31, 2020 |  |  |  |  |
Leasehold improvements | $ | 15,179,447 |  |  | $ | (6,549,418) |  |  | $ | 8,630,029 |
Laboratory equipment | 4,788,678 |  |  | (3,727,508) |  |  | 1,061,170 |
Office furniture and fixtures | 2,828,675 |  |  | (2,296,942) |  |  | 531,733 |
Computer equipment and other | 4,544,915 |  |  | (3,419,703) |  |  | 1,125,212 |
| $ | 27,341,715 |  |  | $ | (15,993,571) |  |  | $ | 11,348,144 |
As of December 31, 2019 |  |  |  |  |
Leasehold improvements | $ | 15,007,935 |  |  | $ | (4,996,777) |  |  | $ | 10,011,158 |
Laboratory equipment | 4,102,467 |  |  | (3,229,357) |  |  | 873,110 |
Office furniture and fixtures | 3,048,053 |  |  | (1,944,293) |  |  | 1,103,760 |
Computer equipment and other | 3,781,020 |  |  | (2,996,031) |  |  | 784,989 |
| $ | 25,939,475 |  |  | $ | (13,166,458) |  |  | $ | 12,773,017 |
Depreciation expense for the years ended December 31, 2020, 2019 and 2018 was $3.0 million, $3.6 million and $3.7 million, respectively. The Company determined that the carrying value of these long-lived assets was not impaired during the periods presented. During the year ended December 31, 2020 the Company disposed of fixed assets with a net book value of $227,000 and accumulated depreciation of $200,000.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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