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Share-based Compensation - Schedule of share-based compensation expenses (Detail) ¥ in Thousands, $ in Thousands | 9 Months Ended
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Sep. 30, 2020 CNY (¥) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expenses | ¥ 26,901 | $ 3,962 | ¥ 5,498
Research and development expenses [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expenses | 11,577 |  | 1,061
General and administrative expenses [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expenses | 7,658 |  | 2,302
Cost of revenues [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expenses | 3,876 |  | 1,447
Sales and marketing expenses [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expenses | ¥ 3,790 |  | ¥ 688

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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