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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Intangible assets | Intangible assets as of December 31, 2019 and September 30, 2020 are summarized as follows:
|  | As of December 31, |  |  | As of September 30, |
|  | 2019 |  |  | 2020 |
|  | RMB |  |  | RMB |  |  | US$ (Note 2.5) |
Cost |  |  |  |  |  |  |  |  |  |  |  |
IPR&D |  |  | 148,844 |  |  |  | 122,000 |  |  |  | 17,969 |
Less: accumulated amortization |  |  | — |  |  |  | — |  |  |  | — |
Net book value |  |  | 148,844 |  |  |  | 122,000 |  |  |  | 17,969 |

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