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Taxation - Summary of Aggregate Amount and Per Share Effect of Tax Holiday (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Taxation
Aggregate dollar effect (In thousands)	$ (197)	$ (3,856)	$ (3,776)
Per share effect-basic	$ 0.00	$ (0.01)	$ (0.01)
Per share effect-diluted	$ 0.00	$ (0.01)	$ (0.01)

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- References

No definition available.

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- Definition

The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330215-122817

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- Definition

Income Tax Holiday, Income Tax Benefits Per Share Basic

+ References

No definition available.

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- Definition

Income Tax Holiday, Income Tax Benefits Per Share Diluted

+ References

No definition available.

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