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Property, Equipment and Leasehold Improvements | 6 Months Ended
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Jun. 30, 2021
Property Plant And Equipment [Abstract] |
Property, Equipment and Leasehold Improvements | 5. Property, Equipment and Leasehold Improvements Property, equipment and leasehold improvements consist of the following at:
|  | June 30, 2021 |  |  | December 31, 2020 |
Laboratory equipment |  | $ | 12,220,329 |  |  | $ | 11,100,116 |
Office equipment |  |  | 1,317,510 |  |  |  | 1,233,823 |
Leasehold improvements |  |  | 6,592,419 |  |  |  | 6,058,400 |
Total |  |  | 20,130,258 |  |  |  | 18,392,339 |
Less: accumulated depreciation and amortization |  |  | (8,430,778 | ) |  |  | (6,132,824 | )
Property, equipment and leasehold improvements, net |  | $ | 11,699,480 |  |  | $ | 12,259,515 |
Depreciation and amortization expense totaled $1,165,385 and $635,104 for the three months ended June 30, 2021 and 2020, respectively, and $2,313,395 and $1,252,573 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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