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Convertible Preferred Shares and Redeemable Convertible Preferred Shares - Additional Information (Detail) ¥ in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 08, 2020 USD ($) shares | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Jan. 01, 2020 shares
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items] |  |  |  |
Proceeds from redeemable convertible preferred stock | ¥ |  | ¥ 124,730 | ¥ 349,395 |
Series A Convertible Preferred Shares [Member] |  |  |  |
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items] |  |  |  |
Preferred stock, shares issued |  |  |  | 458,116,000
Preferred stock, shares outstanding |  |  |  | 458,116,000
Series B Convertible Preferred Shares [Member] |  |  |  |
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items] |  |  |  |
Temporary equity, shares issued |  |  |  | 153,603,600
Temporary equity, shares outstanding |  |  |  | 153,603,600
Series C Convertible Preferred Shares [Member] |  |  |  |
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items] |  |  |  |
Temporary equity, shares issued |  |  |  | 185,665,192
Temporary equity, shares outstanding |  |  |  | 185,665,192
Series D Convertible Preferred Shares [Member] |  |  |  |
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items] |  |  |  |
Temporary equity, shares issued |  |  |  | 842,738,782
Temporary equity, shares outstanding |  |  |  | 842,738,782
Series D+ Convertible Preferred Shares [Member] |  |  |  |
Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items] |  |  |  |
Temporary equity, shares issued |  |  |  | 55,089,998
Temporary equity, shares outstanding |  |  |  | 55,089,998
Proceeds from redeemable convertible preferred stock | $ | $ 20,000 |  |  |
Temporary equity shares issued during the period shares | 22,035,999 |  |  |

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- Definition Convertible Preferred Stock and Redeemable Convertible Preferred Stock [Line Items] + References No definition available. + Details
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- Definition Temporary equity shares issued during the period shares. + References No definition available. + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + 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=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + 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=120391452&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=123570139&loc=d3e3255-108585 + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and 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=120391452&loc=d3e13212-122682 + 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=120391452&loc=d3e13212-122682 + Details
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