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Redeemable Convertible Preferred Shares - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  |  |  | 12 Months Ended |  |  |  |
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Oct. 20, 2017 $ / shares shares | Feb. 09, 2015 USD ($) $ / shares shares | Feb. 13, 2014 USD ($) $ / shares shares | Sep. 13, 2012 USD ($) $ / shares shares | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares | Jun. 30, 2012 $ / shares
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares, issued, price per share | $ / shares |  |  |  |  |  |  |  | $ 0.5300 | $ 0.7200 | $ 1.422 |
Share split, description |  |  |  |  | Each of ordinary share and preferred share of the Company was subdivided into 100 shares at a par value of US$0.00001 |  |  |  |  |  |
Preferred stock shares converted and designated | 100 |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares | $ 0.00001 |  |  |  |  |  |  | $ 0.00001 |  |  | $ 0.00001
Preferred shares, par value | $ / shares | $ 0.00001 |  |  |  |  |  |  |  |  |  |
Preferred shares accretion recognized | ¥ |  |  |  |  | ¥ 0 | ¥ 0 | ¥ 3,073,471 |  |  |  |
Series A Convertible Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares, issued | shares |  |  |  | 2,850,000 |  |  |  |  |  |  |
Proceeds from issuance of convertible redeemable preferred shares | $ |  |  |  | $ 4,560 |  |  |  |  |  |  |
Convertible redeemable preferred shares, issued, price per share | $ / shares |  |  |  | $ 1.60 |  |  |  |  |  |  |
Convertible redeemable preferred shares, outstanding | shares | 285,000,000 |  |  |  |  |  |  |  |  |  |
Series B Convertible Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares, issued | shares |  |  | 2,142,857 |  |  |  |  |  |  |  |
Proceeds from issuance of convertible redeemable preferred shares | $ |  |  | $ 15,000 |  |  |  |  |  |  |  |
Convertible redeemable preferred shares, issued, price per share | $ / shares |  |  | $ 7.00 |  |  |  |  |  |  |  |
Convertible redeemable preferred shares, outstanding | shares | 214,285,700 |  |  |  |  |  |  |  |  |  |
Series C Convertible Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares, issued | shares |  | 2,345,547 |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible redeemable preferred shares | $ |  | $ 46,667 |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares, issued, price per share | $ / shares |  | $ 19.90 |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares, outstanding | shares | 234,554,700 |  |  |  |  |  |  |  |  |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow from issuance of callable preferred stock which is identified as being convertible to another type of financial security at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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