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Property and Equipment | 6 Months Ended
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Jun. 30, 2021
Property and Equipment |
Property and Equipment | 4. Property and Equipment ​ Property and equipment, net consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Furniture and fixtures | ​ | $ | 345,712 | ​ | $ | 345,712
Laboratory equipment | ​ |  | 1,406,346 | ​ |  | 1,446,596
Office equipment | ​ |  | 16,755 | ​ |  | 16,755
Computer equipment | ​ |  | 300,010 | ​ |  | 327,776
Leasehold improvements | ​ | ​ | 616,133 | ​ | ​ | 616,133
Property and equipment | ​ |  | 2,684,956 | ​ |  | 2,752,972
Less accumulated depreciation | ​ |  | (2,193,868) | ​ |  | (2,132,299)
Property and equipment, net | ​ | $ | 491,088 | ​ | $ | 620,673
​ Depreciation expense was $67,485 and $67,681 for the three months ended June 30, 2021 and 2020, respectively, and $135,573 and $135,872 for the six months ended June 30, 2021 and 2020, respectively.

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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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