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Summary of Significant Accounting Policies - Property, plant and equipment (Details)
 12 Months Ended
Dec. 31, 2023
Leasehold improvements | Minimum  
Office equipment  
Estimated useful lives of property, plant and equipment 2 years
Leasehold improvements | Maximum  
Office equipment  
Estimated useful lives of property, plant and equipment 3 years
Machinery  
Office equipment  
Estimated useful lives of property, plant and equipment 3 years
Office equipment  
Office equipment  
Estimated useful lives of property, plant and equipment 5 years