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Summary of significant accounting policies - Additional Information (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2020 CNY (¥) | Mar. 31, 2020 CNY (¥) | Jun. 30, 2020 USD ($) segment | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Summary of significant accounting policies |  |  |  |  |  |  |
Inventory write-down |  |  | $ 7 |  | $ 0 |  |
Impairment of investments |  |  | $ 0 |  |  |  |
Land use rights lease term |  |  | 30 years |  |  |  |
Amortization expenses |  |  | $ 127 | $ 118 |  |  |
Finite-lived intangible assets, Amortization expense, Remainder of 2020 |  |  | 151 |  |  |  |
Finite-lived intangible assets, Amortization expense, 2021 |  |  | 301 |  |  |  |
Finite-lived intangible assets, Amortization expense, 2022 |  |  | 299 |  |  |  |
Finite-lived intangible assets, Amortization expense, 2023 |  |  | 286 |  |  |  |
Finite-lived intangible assets, Amortization expense, 2024 |  |  | 178 |  |  |  |
Finite-lived intangible assets, Amortization expense, after year five |  |  | 1 |  |  |  |
Impairment of long-lived assets |  |  | $ 0 |  |  |  |
Revenue, Practical Expedient, Financing Component [true false] |  |  | true |  |  |  |
Cash grants recorded in other income |  |  | $ 2,024 | 193 |  |  |
Cash grants recorded in deferred income |  |  | $ 2,321 |  | 2,023 |  |
Reimbursement recognized period |  |  | 5 years |  |  |  |
Unrecognized tax benefits and related interest and penalties |  |  | $ 0 | 0 |  |  |
Number of reportable segments | segment |  |  | 1 |  |  |  |
Aggregate amount of cash and cash equivalents |  |  | $ 258,604 | 91,603 | $ 75,932 |  |
Exclusive Promotion Agreement | Hanhui |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |
Payment of upfront fees | ¥ | ¥ 90,000 | ¥ 230,000 |  |  |  |  |
Upfront payment recorded in deferred income |  |  | $ 12,713 |  |  |  |
Foreign Currency Risk | Cash and Cash Equivalents |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |
Aggregate amount of cash and cash equivalents | ¥ |  |  |  |  |  | ¥ 165,488 | ¥ 47,168
Concentration risk percentage |  |  | 9.00% |  | 9.00% |  |
Deferred Income |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |
Reimbursements recognized |  |  | $ 702 |  | $ 858 |  |
Other Income |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |
Reimbursements recognized |  |  | $ 156 | $ 156 |  |  |
Minimum |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |
Intangible assets amortization period |  |  | 1 year |  |  |  |
Maximum |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |
Intangible assets amortization period |  |  | 5 years |  |  |  |

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