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Property and Equipment | 12 Months Ended
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Dec. 31, 2022
Property and Equipment |
Property and Equipment | 5. Property and Equipment Property and equipment, net consisted of the following at December 31: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
Furniture and fixtures | ​ | $ | 342,203 | ​ | $ | 345,712
Laboratory equipment | ​ |  | 1,343,081 | ​ |  | 1,406,346
Office equipment | ​ |  | 17,762 | ​ |  | 17,762
Computer equipment | ​ |  | 309,826 | ​ |  | 305,784
Leasehold improvements | ​ | ​ | 616,133 | ​ | ​ | 616,133
Property and equipment | ​ |  | 2,629,005 | ​ |  | 2,691,737
Less accumulated depreciation | ​ |  | (2,386,615) | ​ |  | (2,322,895)
Property and equipment, net | ​ | $ | 242,390 | ​ | $ | 368,842
​ Depreciation of property and equipment totaled $207,145, $264,600 and $270,754 for the years ended December 31, 2022, 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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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