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Redeemable Convertible Preferred Shares - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
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May 31, 2021 USD ($) shares | Mar. 31, 2021 CNY (¥) shares | Mar. 31, 2021 USD ($) $ / shares shares | Apr. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | May 31, 2019 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Jan. 31, 2019 USD ($) $ / shares shares | Nov. 30, 2018 USD ($) $ / shares shares | Oct. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | May 31, 2018 USD ($) $ / shares shares | Apr. 30, 2014 CNY (¥) shares | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2019 CNY (¥) | Jun. 30, 2021 shares
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 6,646,458 | $ 1,042,974 | ¥ 2,171,263 | ¥ 961,095 |
Dividends declared | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 |
Tempory equity accretion to redemption value adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 288,400 | $ 45,300 | 320,301 | 74,558 |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Modification of preferred shares percentage immediately after change in terms compared to the fair value of the preferred shares immediately before the amendment at each modification date |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |
Maximum [Member] | Exceeding Ten Percent Result To Extinguishment Accounting [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of change in fair value used to determine the applicability of accounting |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |
Minimum [Member] | Not Exceeding Ten Percent Result To Modification Accounting [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of change in fair value used to determine the applicability of accounting |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |
Series Angel Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 5,910,100 |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares | ¥ |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 10,000 |  |  |  |  |
Series Pre-A Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  |  |  |  |  |  |  |  |  | 8,985,050 |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares | $ |  |  |  |  |  |  |  |  |  |  |  | $ 6,500 |  |  |  |  |  |
Temporary equity, shares issued price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.72 |  |  |  |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Series A Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  |  |  |  |  |  |  |  | 22,096,550 |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares | $ |  |  |  |  |  |  |  |  |  |  | $ 17,400 |  |  |  |  |  |  |
Temporary equity, shares issued price per share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.79 |  |  |  |  |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Series A+ Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  |  |  |  |  |  |  | 1,060,200 |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares | $ |  |  |  |  |  |  |  |  |  | $ 1,800 |  |  |  |  |  |  |  |
Temporary equity, shares issued price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 1.65 |  |  |  |  |  |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Series B Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  |  |  |  | 2,332,400 |  | 17,140,700 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares |  |  |  |  |  |  | $ 5,500 |  | $ 40,400 |  |  |  |  |  |  |  | 961,100 |
Temporary equity, shares issued price per share | $ / shares |  |  |  |  |  |  | $ 2.36 |  | $ 2.36 |  |  |  |  |  |  |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Stock issuance costs | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 5,000 |  |  |  |
Series B2 Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  |  |  |  |  | 11,072,800 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares |  |  |  |  |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  | 961,100 |
Temporary equity, shares issued price per share | $ / shares |  |  |  |  |  |  |  | $ 2.71 |  |  |  |  |  |  |  |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Stock issuance costs | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 3,300 |  |  |  |
Series B3 Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  |  |  | 28,013,200 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares |  |  |  |  |  | $ 110,000 |  |  |  |  |  |  |  |  |  |  | 961,100 |
Temporary equity, shares issued price per share | $ / shares |  |  |  |  |  | $ 3.93 |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Stock issuance costs | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 9,000 |  |  |  |
Series B4 Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  |  | 6,989,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares |  |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |  |  |  | ¥ 961,100 |
Temporary equity, shares issued price per share | $ / shares |  |  |  |  | $ 4.29 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Stock issuance costs | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 9,900 |  |  |  |
Series B4 Preferred Shares [Member] | Series B4 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  | 6,989,750 | 6,989,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares | ¥ |  | ¥ 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B4 Preferred Shares [Member] | Eat Together Holding Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation arrangement number shares issued |  |  |  | 605,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B4-1 Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Series B4-1 Preferred Shares [Member] | Founder [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  | 6,664,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B4-1 Preferred Shares [Member] | Founder [Member] | Eat Together Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  |  |  | 6,664,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares | $ |  |  |  | $ 28,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series C1 Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  | 2,895,100 | 2,895,100 | 39,952,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares |  | ¥ 22,500 |  | $ 310,500 |  |  |  |  |  |  |  |  |  |  |  | ¥ 2,171,300 |  |
Temporary equity, shares issued price per share | $ / shares |  |  | $ 7.77 | $ 7.77 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 19,600 | $ 3,000 |  |  |
Series C1 Preferred Shares [Member] | Two Thousand Nineteen Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued |  |  |  | 11,377,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series Angel+ Preferred Shares [Member] | Founder [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares issued |  |  |  |  |  | 7,803,400 |  |  |  |  |  |  |  |  |  |  |  |
Series Angel+ Preferred Shares [Member] | Eat Together Holding Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation arrangement number shares issued |  |  |  | 465,550 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series Angel Preferred Shares and Series Angel+ Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of annual compound interest from the actual payment date of original issue price used to determine the redemption price of preferred share |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Percentage of annual simple interest from the actual payment date of original issue price used to determine the redemption price of preferred share |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Series Angel+ Preferred Shares and Series Angel Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference percentage of original price as adjusted for share subdivision on each preferred share |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Series D Redeemable Convertible Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued |  | 49,207,650 | 49,207,650 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  | ¥ 6,646,500 | $ 1,043,000 |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 39,700 | $ 6,100 |  |  |
Series D+ redeemable convertible preferred shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred shares issued | 21,264,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of redeemable convertible preferred shares | $ 330,000 |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 6,646,500 | $ 1,043,000 |  |  |
Preferred shares liquidation preference percentage of original issue price |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 21,300 | $ 3,300 |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tempory equity accretion to redemption value adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 207,598 | $ 32,577 |  |  |
Common Stock, shares, issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 299,797,728 | 299,797,728 | 0 |  | 250,826,100

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- Definition Percentage of annual simple interest from the actual payment date of original issue price used to determine the redemption price of preferred share. + References No definition available. + Details
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- Definition Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price. + References No definition available. + Details
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- Definition Preferred stock liquidation preference percentage of original price as adjusted for share subdivision on each preferred share. + References No definition available. + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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=120391452&loc=d3e13212-122682 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 + Details
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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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