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Long-term investments - Equity method investment prospectively from the date of deconsolidation (Details) ¥ in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2022 CNY (¥)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Long-term investments
Equity method investments		¥ 10,523		¥ 252,407
Add: Carrying amount of redeemable noncontrolling interest					¥ 40,750
Less: Carrying amount of non-redeemable noncontrolling interest					(7,178)
Gain as a result of deconsolidation	¥ 71,974	¥ 0	$ 0	¥ 0	71,974
Suzhou Photon-Matrix
Long-term investments
Equity method investments	¥ 64,000				64,000
Less: Carrying amount of Suzhou Photon-Matrix’s net assets					(25,598)
Gain as a result of deconsolidation					¥ 71,974

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- Definition

Portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent entity which is not redeemable by the parent entity.

+ References

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The amount of the reduction or elimination during the period of a redeemable noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

+ References

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- Definition

Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

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This item represents the entity's ownership percentage in the investee multiplied by the investee's total equity.

+ References

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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