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Condensed Financial Information of the Company Condensed Balance Sheet (Parenthetical) (Details) - $ / shares | Dec. 31, 2019 | Nov. 08, 2019 | Aug. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Condensed Balance Sheets |  |  |  |
Ordinary shares, par value (in US dollar per share) | $ 0.0001 |  |  | $ 0.0001
Ordinary shares, shares authorized (in shares) | 0 |  | 4,326,574,000 | 4,326,574,000
Ordinary shares, shares issued (in shares) | 0 |  | 189,388,000 | 233,800,850
Ordinary shares, shares outstanding (in shares) | 0 |  | 189,388,000 | 233,800,850
Treasury stock (in shares) | 2,561,468 |  |  | 0
Class A ordinary shares |  |  |  |
Condensed Balance Sheets |  |  |  |
Ordinary shares, par value (in US dollar per share) | $ 0.0001 | $ 0.0001 |  | $ 0.0001
Ordinary shares, shares authorized (in shares) | 4,903,917,300 |  |  | 0
Ordinary shares, shares issued (in shares) | 841,275,820 |  |  | 0
Ordinary shares, shares outstanding (in shares) | 841,275,820 |  |  |
Class B ordinary shares |  |  |  |
Condensed Balance Sheets |  |  |  |
Ordinary shares, par value (in US dollar per share) | $ 0.0001 | $ 0.0001 |  |
Ordinary shares, shares authorized (in shares) | 96,082,700 |  |  | 0
Ordinary shares, shares issued (in shares) | 96,082,700 |  |  | 0
Ordinary shares, shares outstanding (in shares) | 96,082,700 |  |  | 0
Parent company | Reportable legal entities |  |  |  |
Condensed Balance Sheets |  |  |  |
Ordinary shares, par value (in US dollar per share) | $ 0.0001 |  |  |
Ordinary shares, shares outstanding (in shares) | 96,082,700 |  |  |
Treasury stock (in shares) | 2,561,468 |  |  |
Parent company | Reportable legal entities | Class A ordinary shares |  |  |  |
Condensed Balance Sheets |  |  |  |
Ordinary shares, par value (in US dollar per share) | $ 0.0001 |  |  |
Ordinary shares, shares authorized (in shares) | 4,903,917,300 |  |  |
Ordinary shares, shares issued (in shares) | 841,275,820 |  |  |
Parent company | Reportable legal entities | Class B ordinary shares |  |  |  |
Condensed Balance Sheets |  |  |  |
Ordinary shares, par value (in US dollar per share) | $ 0.0001 |  |  |
Ordinary shares, shares authorized (in shares) | 96,082,700 |  |  |
Ordinary shares, shares issued (in shares) | 96,082,700 |  |  |

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