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Pre-Ipo Preferred Shares - Additional information (Detail) |  | 1 Months Ended | 12 Months Ended
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Oct. 18, 2019 shares | Apr. 30, 2021 shares | Jul. 31, 2018 $ / shares shares | Dec. 31, 2017 shares | Jul. 31, 2017 USD ($) shares | Jun. 30, 2017 USD ($) shares | Jan. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Feb. 28, 2014 USD ($) shares | Mar. 31, 2012 USD ($) shares | Mar. 31, 2011 USD ($) shares | Dec. 31, 2021 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  | 3,685,504 |  |  |  |  |  |  |  |  |  |
Minimum Pre-offering Valuation | $ |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000
IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Minimum Pre-offering Valuation | $ |  |  |  |  |  |  |  |  |  |  |  | 400,000,000
Proceeds From Conversion Of Preferred Stock | $ |  |  |  |  |  |  |  |  |  |  |  | 40,000,000
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Conversion Of Preferred Stock | $ |  |  |  |  |  |  |  |  |  |  |  | $ 70,000,000
Cyber Dreamer Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number Of Shares Transferred | 17,597,981 |  |  |  |  |  |  |  |  |  |  |
Series A Convertible Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock | $ |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |
Stock Splits, shares issued during the period |  |  | 100,000,000 |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 0.10
Series A Convertible Redeemable Preferred Shares [Member] | Matrix Partners China I Hong Kong Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  |  |  |  |  | 10,000,000 |
Series B Convertible Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock | $ |  |  |  |  |  |  |  |  |  | $ 2,500,000 |  |
Stock issued, during the period |  |  |  |  |  |  |  |  |  | 8,333,332 |  |
Stock Splits, shares issued during the period |  |  | 83,333,320 |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 0.10
Series B Convertible Redeemable Preferred Shares [Member] | Matrix Partners China I Hong Kong Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  |  |  |  | 6,666,666 |  |
Series B Convertible Redeemable Preferred Shares [Member] | Morning side China TMT Fund II LP [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock | $ |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |
Stock issued, during the period |  |  |  |  |  |  |  |  |  | 1,666,666 |  |
Stock Splits, shares issued during the period |  |  | 33,333,330 |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 0.10
Series B Convertible Redeemable Preferred Shares [Member] | Morning side China TMT Fund II LP [Member] | 2014 Loan [member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  |  |  | 3,333,333 |  |  |
Series C Convertible Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock | $ |  |  |  |  |  |  |  | $ 10,894,477 |  |  |  |
Stock issued, during the period |  |  |  |  |  |  |  | 11,725,839 |  |  |  |
Stock Splits, shares issued during the period |  |  | 117,258,390 |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 0.10
Series C Convertible Redeemable Preferred Shares [Member] | 2014 Loan [member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  |  | 2,532,494 |  |  |  |
Stock Splits, shares issued during the period |  |  | 25,324,940 |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 0.10
Series C Convertible Redeemable Preferred Shares [Member] | Matrix Partners China I Hong Kong Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  |  | 5,192,086 |  |  |  |
Series C Convertible Redeemable Preferred Shares [Member] | Matrix Partners China I Hong Kong Limited [Member] | 2014 Loan [member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  |  | 1,266,247 |  |  |  |
Series C Convertible Redeemable Preferred Shares [Member] | Morning side China TMT Fund II LP [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  |  | 6,533,753 |  |  |  |
Series C Convertible Redeemable Preferred Shares [Member] | Morning side China TMT Fund II LP [Member] | 2014 Loan [member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  |  | 1,266,247 |  |  |  |
Series C1 Convertible Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock | $ |  |  |  |  |  |  | $ 3,223,675 |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  | 3,469,736 |  |  |  |  |
Stock Splits, shares issued during the period |  |  | 34,697,360 |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 0.10
Series C1 Convertible Redeemable Preferred Shares [Member] | People Better Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  | 1,734,868 |  |  |  |  |
Series C1 Convertible Redeemable Preferred Shares [Member] | Shunwei Internet Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  |  |  | 1,734,868 |  |  |  |  |
Series C1 Plus Convertible Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, during the period |  |  |  | 2,691,209 |  |  |  |  |  |  |  |
Stock Splits, shares issued during the period |  |  | 26,912,090 |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 0.10
Series D Convertible Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  | 0.0001 |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 0.10
Series D Convertible Redeemable Preferred Shares [Member] | Cyber Dreamer Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock | $ |  |  |  |  | $ 10,000,000 | $ 22,000,000 |  |  |  |  |  |
Stock issued, during the period |  |  |  |  | 4,004,775 | 8,810,504 |  |  |  |  |  |
Stock Splits, shares issued during the period |  |  |  |  | 40,047,750 | 88,105,040 |  |  |  |  |  |
Series D1 Convertible Redeemable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 0.10
Series D1 Convertible Redeemable Preferred Shares [Member] | Cyber Dreamer Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock | $ |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |
Stock issued, during the period |  |  |  |  | 2,002,387 |  |  |  |  |  |  |
Stock Splits, shares issued during the period |  |  |  |  | 20,023,870 |  |  |  |  |  |  |

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