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Repurchase of shares - Summary of the Shares Repurchased by the Company (Detail) - Share Buyback Program [Member] - USD ($)	1 Months Ended		12 Months Ended
	Aug. 18, 2020	Jul. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2020
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorized amount						$ 20,000,000
Total number of ADS Purchased	334,245	857,147	1,191,392	0	0
Average price paid per share	$ 3.86	$ 3.72
Approximate Dollar Value of ADSs that May Yet Be Purchased Under the Plan			$ 4,475,000

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Represents the number of American Depositary Shares that have been repurchased during the period.

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