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Share repurchase program (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 shares | Jan. 31, 2019 CNY (¥) shares | Jan. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2019 CNY (¥)
Repurchase of shares cost | ¥ |  |  |  |  |  | ¥ 131,010
ADS |  |  |  |  |  |
Authorized amount | $ |  |  |  |  | $ 1,000,000 |
Repurchase period (in months) |  |  |  | 12 months | 12 months |
Shares repurchased during the year (in ADS shares) | shares | 2,332,048 | 935,848 | 935,848 | 1,396,200 | 1,396,200 |
Repurchase of shares cost |  | ¥ 131,010 | $ 19,101 | ¥ 205,886 | $ 29,999 |
Weighted average repurchase price (in dollars per ADS) | $ / shares |  |  | $ 20.41 |  | $ 21.48 |

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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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