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Repurchase of shares - Summary of the Shares Repurchased by the Company (Detail) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		12 Months Ended
	Feb. 10, 2017	Jan. 13, 2017	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]
Payments for Repurchase of Preferred Stock and Preference Stock					$ 358
Approximate Dollar Value of ADSs that May Yet Be Purchased Under the Plan						$ 5,300
Share Repurchase Program 2017 [Member]
Equity, Class of Treasury Stock [Line Items]
Total Number of ADS Purchased	5,553	994	93,070	86,523
Average Price Paid Per Share	$ 3.75	$ 4.34		$ 3.86

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- 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.

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- Definition

The cash outflow to reacquire preferred stock during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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Amount remaining of a stock repurchase plan authorized.

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- Definition

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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