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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 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 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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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 + Details
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- Definition Represents the number of American Depositary Shares that have been repurchased during the period. + References No definition available. + Details
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