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Property and Equipment | 6 Months Ended
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Jun. 30, 2020
Property and Equipment |
Property and Equipment | 4. Property and Equipment ​ Property and equipment, net consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ |  | 2020 |  | 2019 |
Furniture and fixtures | ​ | $ | 345,712 | ​ | $ | 345,712 | ​
Laboratory equipment | ​ |  | 1,417,952 | ​ |  | 1,409,526 | ​
Office equipment | ​ |  | 16,755 | ​ |  | 11,085 | ​
Computer equipment | ​ |  | 309,024 | ​ |  | 302,009 | ​
Leasehold improvements | ​ | ​ | 616,133 | ​ | ​ | 616,133 | ​
Property and equipment | ​ |  | 2,705,576 | ​ |  | 2,684,465 | ​
Less accumulated depreciation | ​ |  | (1,997,417) | ​ |  | (1,861,545) | ​
Property and equipment, net | ​ | $ | 708,159 | ​ | $ | 822,920 | ​
​ Depreciation expense was $67,681 and $71,191 for the three months ended June 30, 2020 and 2019, respectively, and $135,872 and $141,631 for the six months ended June 30, 2020 and 2019, 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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