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PROPERTY, EQUIPMENT AND SOFTWARE, NET | 12 Months Ended
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Dec. 31, 2022
PROPERTY, EQUIPMENT AND SOFTWARE, NET |
PROPERTY, EQUIPMENT AND SOFTWARE, NET | 5. PROPERTY, EQUIPMENT AND SOFTWARE, NET Property, equipment and software consisted of the following: ​
​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2021 |  | 2022
​ | ​ | US$ | ​ | US$
Machinery and laboratory equipment | ​ | 5,252,399 |  | 5,293,386
Leasehold improvements | ​ | 1,152,743 |  | 1,055,271
Electronic equipment | ​ | 1,863,956 |  | 1,863,963
Furniture and tools | ​ | 81,467 |  | 29,684
Vehicles | ​ | 87,680 |  | 80,266
Software | ​ | 371,636 |  | 369,698
Total property, equipment and software | ​ | 8,809,881 |  | 8,692,268
Less: accumulated depreciation and amortization | ​ | (5,322,264) |  | (5,909,305)
Net book value | ​ | 3,487,617 |  | 2,782,963
​ Depreciation and amortization expenses recognized for the years ended December 31, 2020, 2021 and 2022 were US$858,408, US$1,125,032 and US$1,145,995 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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