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Non-controlling interests - Additional Information (Details) ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 30, 2022 CNY (¥) | Jan. 31, 2022 CNY (¥) | Oct. 31, 2021 CNY (¥) | Sep. 30, 2021 CNY (¥) | Aug. 31, 2021 CNY (¥) | May 31, 2021 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2023 USD ($) | Jun. 30, 2023
Non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |
Accretion of redeemable non-controlling interests |  |  |  | ¥ 1,000 |  |  | ¥ 0 | $ 0 | ¥ (714) | ¥ (1,306) |  |
Percentage of redeemable noncontrolling interest per annum |  |  |  | 49.00% |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  | 2.00% |  |  |  |  |  |  |  |
Decrease in paid-in capital |  |  |  |  |  |  |  |  |  | 202,000 |  |
Non-redeemable non-controlling interests |  |  |  | ¥ 14,335 |  |  | 86,951 |  | 161,940 |  | $ 12,247 |
Carrying amount of relevant non-redeemable non-controlling interests derecognized upon deconsolidation |  |  |  |  |  |  |  |  |  | 14,335 |  |
Redeemable non-controlling interests |  |  |  |  |  |  | ¥ 0 |  | ¥ 0 | 30,500 |  |
Suzhou Photon-Matrix |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |
Accretion of redeemable non-controlling interests |  |  | ¥ 30,000 |  | ¥ 520 | ¥ 6,000 |  |  |  |  |  |
Percentage of redeemable noncontrolling interest per annum |  | 10.00% | 10.00% |  |  | 40.00% |  |  |  |  |  |
Total cash consideration |  |  |  |  |  | ¥ 4,000 |  |  |  | 2,000 |  |
Percentage of equity interest |  |  | 10.71% |  | 2.97% |  |  |  |  |  |  |
Decrease in paid-in capital |  |  |  |  | ¥ 105 |  |  |  |  |  |  |
Redeemable non-controlling interest period |  | 7 years | 7 years |  |  |  |  |  |  |  |  |
Redemption price |  |  | ¥ 30,000 |  |  |  |  |  |  |  |  |
Suzhou Photon-Matrix |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  |  |  | 60.00% |  |  |  |  |  |
Accretion of redeemable non-controlling interests |  | ¥ 10,000 |  |  |  |  |  |  |  |  |  |
Percentage of equity interest |  | 3.45% |  |  |  |  |  |  |  |  |  |
Redemption price |  | ¥ 10,000 |  |  |  |  |  |  |  |  |  |
Group |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  | 49.17% |  |  |  |  |  |  |  |  |  |
Carrying amount of relevant non-redeemable non-controlling interests derecognized upon deconsolidation | ¥ (7,178) |  |  |  |  |  |  |  |  |  |  |
Group | JICA |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  |  |  |  |  |  | 70.00%
Non-redeemable non-controlling interest percentage |  |  |  |  |  |  |  |  |  |  |  | 30.00%
Mezzanine equity |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |
Redeemable non-controlling interests |  |  | ¥ 30,000 |  |  |  |  |  |  | ¥ 30,500 |  |

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