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Share-based Compensation - Share options, additional information (Details) $ / shares in Units, ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CNY (¥) $ / shares | Dec. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares | Dec. 31, 2019 USD ($) $ / shares
Share Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Weighted-average grant date fair value of options granted (US$ per share) | $ 0.20 | $ 0.48 | $ 0.48 |
Unrecognized share-based compensation for options | $ 9.4 |  |  | $ 1.4
Remaining weighted-average period for recognition | 3 years 2 months 12 days |  |  |
Ordinary Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Closing stock price (US$ per share) |  |  |  | $ 0.25
ADS |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Closing stock price (US$ per share) |  |  |  | $ 1.97

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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