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Share-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) - CNY (¥) ¥ in Thousands | 12 Months Ended
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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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