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Share-based Compensation - Share options, June 2008 scheme (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
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Jan. 31, 2018 item shares | Sep. 30, 2017 item $ / shares shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2017 CNY (¥) shares
Share Options |  |  |  |  |  |
Maximum percentage of ordinary shares in issue upon exercise of all outstanding options granted and yet to be exercised |  |  | 30.00% | 30.00% |  |
Recognized share-based compensation |  |  | ¥ 20,221 | $ 2,905 | ¥ 13,989 | ¥ 20,852
Number of Options, Granted |  |  | 15,794,018 | 15,794,018 | 3,719,500 | 7,255,000
June 2018 Scheme |  |  |  |  |  |
Share Options |  |  |  |  |  |
Maximum percentage of the ordinary shares in issue on effective date of option scheme ("Limit") |  |  | 10.00% | 10.00% |  |
Maximum percentage of ordinary shares in issue on effective date of limit as refreshed (Refreshed "Limit") |  |  | 10.00% | 10.00% |  |
Share options, expiration period |  |  | 4 years | 4 years |  |
Award vesting period |  |  | 10 years | 10 years |  |
June 2018 Scheme | Non employee |  |  |  |  |  |
Share Options |  |  |  |  |  |
Share options, expiration period | 10 years |  |  |  |  |
Award vesting period | 4 years |  |  |  |  |
Number of Options, Granted | 3,314,500 |  |  |  |  |
Number of non employees | item | 2 |  |  |  |  |
June 2008 Scheme, Plan Modification |  |  |  |  |  |
Share Options |  |  |  |  |  |
Recognized share-based compensation |  |  | ¥ 100 | $ 20 | ¥ 1,300 | ¥ 5,900
June 2008 Scheme | Non employee |  |  |  |  |  |
Share Options |  |  |  |  |  |
Share options, expiration period |  | 10 years |  |  |  |
Award vesting period |  | 4 years |  |  |  |
Number of Options, Granted |  | 1,720,000 |  |  |  |
Number of non employees | item |  | 1 |  |  |  |
Grant date fair value of options granted (US$ per share) | $ / shares |  | $ 0.4648 |  |  |  |

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- Definition Maximum percentage of ordinary shares in issue on effective date of option scheme ("Limit") + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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