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Share-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
stockbased compensation expense [Line Items]
Share-based Payment Arrangement, Expense	¥ 1,923,646	¥ 657,236	¥ 34,250
Cost of Sales [Member]
stockbased compensation expense [Line Items]
Share-based Payment Arrangement, Expense	31,467	1,920	944
Selling and Marketing Expense [Member]
stockbased compensation expense [Line Items]
Share-based Payment Arrangement, Expense	73,733	21,473	8,443
Research and Development Expense [Member]
stockbased compensation expense [Line Items]
Share-based Payment Arrangement, Expense	137,820	30,883	13,595
General and Administrative Expense [Member]
stockbased compensation expense [Line Items]
Share-based Payment Arrangement, Expense	¥ 1,680,626	¥ 602,960	¥ 11,268

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- Definition

stockbased compensation expense

+ References

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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