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Summary of significant accounting policies - Property and equipment, net (Details)
Dec. 31, 2023
Property, plant and equipment  
Depreciation is computed using the straight-line method (as a percent) 5.00%
Furniture and office equipment | Minimum  
Property, plant and equipment  
Estimated useful life of property, plant and equipment 3 years
Furniture and office equipment | Maximum  
Property, plant and equipment  
Estimated useful life of property, plant and equipment 5 years
Machinery | Minimum  
Property, plant and equipment  
Estimated useful life of property, plant and equipment 5 years
Machinery | Maximum  
Property, plant and equipment  
Estimated useful life of property, plant and equipment 10 years
Vehicles | Minimum  
Property, plant and equipment  
Estimated useful life of property, plant and equipment 3 years
Vehicles | Maximum  
Property, plant and equipment  
Estimated useful life of property, plant and equipment 5 years
Computer equipment | Minimum  
Property, plant and equipment  
Estimated useful life of property, plant and equipment 3 years
Computer equipment | Maximum  
Property, plant and equipment  
Estimated useful life of property, plant and equipment 5 years