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Income Taxes - Income tax rates (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income taxes
Income tax rate	25.00%	25.00%	25.00%
Hong Kong
Income taxes
Income tax rate	16.50%
Hong Kong | First HK$2 million
Income taxes
Income tax rate	8.25%
Hong Kong | In excess of HK$2 million
Income taxes
Income tax rate	16.50%
China
Income taxes
Enterprise income tax rate	25.00%
Preferential tax rate as High and New Technology Enterprises	15.00%

X

- Definition

Represents the enterprise income tax rate.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Represents the preferential tax rate as High and New Technology Enterprises.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

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- Details

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