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PROPERTY, EQUIPMENT AND SOFTWARE, NET (Tables) | 12 Months Ended
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Dec. 31, 2022
PROPERTY, EQUIPMENT AND SOFTWARE, NET |
Summary of property, equipment and software | ​
​ | ​ | ​ | ​ | ​
​ | ​ | 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
​

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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