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Share-Based Compensation - Schedule of Share-Based Compensation Expenses Related to Restricted Shares (Detail) ¥ in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 CNY (¥) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 CNY (¥) | Dec. 31, 2019 CNY (¥)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Share-based compensation expenses related to restricted shares | ¥ 392,576 | $ 57,820 | ¥ 515,193 | ¥ 515,203
Restricted Shares [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Share-based compensation expenses related to restricted shares | 0 | 0 | 1,556 | 1,566
Research and Development Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Share-based compensation expenses related to restricted shares | 224,619 | 33,083 | 467 | 470
Research and Development Expense [Member] | Restricted Shares [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Share-based compensation expenses related to restricted shares | 0 | 0 | 467 | 470
General and Administrative Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Share-based compensation expenses related to restricted shares | 167,957 | 24,737 | 514,726 | 514,733
General and Administrative Expense [Member] | Restricted Shares [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Share-based compensation expenses related to restricted shares | ¥ 0 | $ 0 | ¥ 1,089 | ¥ 1,096

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