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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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- 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. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + 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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