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Income Taxes - Tax rates (Details)			12 Months Ended
	Nov. 30, 2018	Apr. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
Statutory tax rate (as a percent)			25.00%	25.00%	25.00%
Hong Kong
Income Taxes
Statutory tax rate (as a percent)			16.50%
Withholding tax rate (as a percent)			0.00%
PRC
Income Taxes
Statutory tax rate (as a percent)			25.00%
Withholding tax rate (as a percent)			10.00%
Xinzhijiang | PRC
Income Taxes
Preferential tax rate (as a percent)		15.00%
Shanghai Xunmeng | PRC
Income Taxes
Preferential tax rate (as a percent)	15.00%

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Represents information pertaining to preferential tax rate.

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Withholding income tax rate on dividends, interests, rent or royalties payable by the Company's PRC subsidiaries, to non-PRC resident enterprises, and proceeds from any such non-resident enterprise investor's disposition of assets (after deducting the net value of such assets).

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 740
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