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Repurchase of shares - Additional Information (Detail) - $ / shares |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Feb. 10, 2017 | Jan. 13, 2017 | Nov. 30, 2016 | Oct. 27, 2016 | Apr. 14, 2016 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 30, 2016 | Sep. 30, 2016 | Aug. 30, 2016 | Jul. 29, 2016 | Jun. 30, 2016 | May 31, 2016 | Mar. 30, 2016 | Dec. 31, 2016
Share Repurchase Program, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of ADS Purchased |  |  | 21,229 | 31,400 | 457,900 |  |  | 173,312 | 15,467 | 229,695 | 555,357 | 111,459 | 449,696 | 408,985 | 2,454,500
Average Price Paid Per Share |  |  | $ 4.61 | $ 5.11 | $ 6.61 |  |  | $ 4.02 | $ 5.33 | $ 5.83 | $ 5.33 | $ 5.24 | $ 6.28 | $ 6.22 |
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. + 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://www.xbrl.org/2003/role/presentationRef -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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