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Convertible Redeemable Preferred Shares - Additional Information (Detail) ¥ in Thousands, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Nov. 27, 2020 USD ($) shares | Feb. 10, 2020 USD ($) shares | Jul. 04, 2019 USD ($) shares | Mar. 08, 2019 USD ($) shares | Dec. 18, 2018 USD ($) shares | Nov. 02, 2017 USD ($) shares | Feb. 10, 2017 USD ($) shares | Aug. 15, 2016 USD ($) shares | Jul. 07, 2016 USD ($) shares | Apr. 08, 2015 USD ($) shares | Dec. 16, 2014 USD ($) shares | May 20, 2014 USD ($) shares | Jun. 30, 2021 shares | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2019 USD ($) shares
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 0 | $ 0 | ¥ 2,803,114 |  | ¥ 993,475 |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred shares to ordinary shares, Shares | shares |  |  |  |  |  |  |  |  |  |  |  |  | 551,352,134 | 551,352,134 | 551,352,134 |  |  |  |
Series A Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 1,057 |  | 2,743 |  | 3,290 |
Series B Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,006 |  | 5,191 |  | ¥ 6,231 |
Series B Redeemable Convertible Preferred Stock [Member] | TECHWOLF LIMITED [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  |  | 13,333,333 |  |  |  |  |  |  |  |
Temporary equity repurchased during the period | shares |  |  |  |  |  |  |  |  |  | 13,333,333 |  |  |  |  |  |  |  |  |
Series E Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,599,104 | 60,599,104
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,072 |  | 133,704 |  | ¥ 145,328 |
Series C Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,580 |  | 35,198 |  | 42,417 |
Series D Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,823 |  | ¥ 28,196 |  | ¥ 35,053 |
Series F Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,354,585 | 99,354,585 |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 85,527 |  | ¥ 78,949 |  |  |
Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,354,585 | 99,354,585 | 60,599,104 | 60,599,104
Preferred Stock convertible, conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  |  |
Temporary equity liquidation preference per share percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |
Threshold shareholding percentage required for redemption notice |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |
Accretion on convertible redeemable preferred shares to redemption value |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 164,065 | $ 25,284 | ¥ 283,981 | $ 41,546 | ¥ 232,319 | $ 33,529
Redeemable Convertible Preferred Stock [Member] | Debt Note to Redeeming Shareholder [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years | 2 years |  |  |  |
Debt instrument interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |
Redeemable Convertible Preferred Stock [Member] | Prior to Issuance of Series F Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity redemption price compound interest per annum |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |
Redeemable convertible preferred stock initial Redemption start date |  | Jul. 05, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock [Member] | Post Issuance of Series F Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity redemption price simple interest per annum |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |  |
Redeemable convertible preferred stock modified Redemption start date |  | Feb. 10, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series A Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  |  |  |  | $ 20 |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series B Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  |  | 26,666,667 |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  |  |  | $ 41 |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series E Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  | 83,474,263 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  | $ 130,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  | $ 3,376 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series C Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  | 48,000,000 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  |  | $ 40 |  |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series C One Redeemable Convertible Preferred Stock [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  | 45,319,316 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  | $ 12,508 |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  | $ 86 |  |  |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series C Two Redeemable Convertible Preferred Stock [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  | 42,251,744 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  | $ 18,000 |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series C Three Redeemable Convertible Preferred Stock [Member] | Tranche Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  | 11,497,073 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  | $ 6,001 |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  | $ 32 |  |  |  |  |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series D Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  | 60,856,049 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  | $ 43,394 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  | $ 1,132 |  |  |  |  |  |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series E One Redeemable Convertible Preferred Stock [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  | 32,373,031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  | $ 55,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  | $ 1,982 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series E Two Redeemable Convertible Preferred Stock [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  | 28,226,073 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  | $ 1,917 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series F Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  | 48,689,976 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  | $ 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Purchase Agreement with Investors [Member] | Series F Plus Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares | 50,664,609 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock | $ 270,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs | $ 3,080 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Convertible Redeemable Preferred Shares [Line Items]. + References No definition available. + Details
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- Definition Redeemable convertible preferred stock initial Redemption start .date + References No definition available. + Details
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- Definition Redeemable convertible preferred stock modified Redemption start date. + References No definition available. + Details
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- Definition Temporary equity liquidation preference per share percentage. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition Number of common shares issuable upon conversion for each share of preferred stock to be converted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + 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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