Schedule of income tax assets and liabilities (Details) - CNY (¥) ¥ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Deferred tax assets: | ||
| Accrued expenses and others | ¥ 129 | ¥ 288 |
| Inventory provision | 32,204 | 35,313 |
| Impairment on prepayments | 70 | 72 |
| Impairment of long-lived assets | 46 | 47 |
| Product warranty | 57 | |
| Intercompany unrealized profit | 4,640 | 4,506 |
| Net operating loss carryforward | 43,725 | 28,066 |
| Total deferred tax assets before valuation allowance | 80,814 | 68,349 |
| Valuation allowance | (23,606) | (1,079) |
| Total deferred tax assets | 57,208 | 67,270 |
| Deferred tax liabilities: | ||
| Unrealized gain and accrued interest income on investments | (256) | (290) |
| Accelerated tax depreciation | (1,739) | (1,184) |
| Total deferred tax liabilities | (1,995) | (1,474) |
| Deferred tax assets, net | ¥ 55,213 | ¥ 65,796 |
| X | ||||||||||
- Definition Impairment of long-lived assets. No definition available.
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| X | ||||||||||
- Definition Deferred tax assets unrealized profit No definition available.
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| X | ||||||||||
- Definition Deferred tax liabilities accelerated tax depreciation No definition available.
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| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from estimated impairment losses. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from warranty reserves. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on trading securities. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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