Long-term investments, net - Investments (Details) ¥ in Thousands, $ in Thousands |
Jun. 30, 2026
USD ($)
|
Apr. 30, 2026
USD ($)
|
Apr. 30, 2026
CNY (¥)
|
Feb. 28, 2026
USD ($)
|
Feb. 28, 2026
CNY (¥)
|
Dec. 31, 2025
USD ($)
|
|---|---|---|---|---|---|---|
| Long-term investments | ||||||
| Equity method investments, net | $ 737 | $ 1,163 | ||||
| Equity securities | 19,642 | 17,507 | ||||
| Available-for-sale debt investments | 41,250 | 42,833 | ||||
| Long-term investments, net | 61,629 | 61,503 | ||||
| SiEngine Technology Co., Ltd. | ||||||
| Long-term investments | ||||||
| Equity method investments, net | 0 | 0 | ||||
| Shenzhen U Chance Technology Co., Ltd. | ||||||
| Long-term investments | ||||||
| Equity method investments, net | 0 | 1,163 | ||||
| ACO Tech Sdn. Bhd. | ||||||
| Long-term investments | ||||||
| Equity method investments, net | 0 | 0 | ||||
| Hangzhou Fuyang Zeji Qushi Equity investment Fund L.P. | ||||||
| Long-term investments | ||||||
| Equity method investments, net | $ 737 | $ 737 | ¥ 5,000 | $ 1,474 | ¥ 10,000 | $ 0 |
| X | ||||||||||
- Definition 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of investment in equity method investee and investment in and advance to affiliate. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|