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v3.22.4

Fixed assets | 12 Months Ended
--- | ---
Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
Fixed assets | 5. Fixed assets Fixed assets, net were as follows at December 31, 2022 and 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Leasehold improvements | ​ | $ | 28,969 | ​ | $ | 19,937
Computer equipment and software | ​ |  | 15,332 | ​ |  | 13,812
Machinery and lab equipment | ​ | ​ | 47,496 | ​ | ​ | 33,187
Furniture and fixtures | ​ |  | 3,812 | ​ |  | 3,805
Assets in process | ​ |  | 14,349 | ​ |  | 9,017
​ | ​ |  | 109,958 | ​ |  | 79,758
Less accumulated depreciation | ​ |  | (37,368) | ​ |  | (27,173)
Total | ​ | $ | 72,590 | ​ | $ | 52,585
​ Depreciation expense was approximately $12.3 million, $9.4 million, and $6.6 million 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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