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Property, Equipment And Software - Schedule of property, equipment and software, net (Detail) ¥ in Thousands, $ in Thousands | Sep. 30, 2020 CNY (¥) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
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Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property, equipment and software | ¥ 51,668 | $ 7,610 | ¥ 47,867
Less: accumulated depreciation and amortization | (25,935) | (3,820) | (18,221)
Net book value | 25,733 | 3,790 | 29,646
Construction in progress | 1,325 | 195 | 423
Total net book value of property, equipment and software | 27,058 | 3,985 | 30,069
Laboratory Equipment [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property, equipment and software | 27,336 | 4,026 | 24,265
Leasehold improvement [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property, equipment and software | 12,605 | 1,857 | 11,856
Software [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property, equipment and software | 10,201 | 1,502 | 10,220
Office furniture and equipment [Member] |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Total property, equipment and software | ¥ 1,526 | $ 225 | ¥ 1,526

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