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Details of Significant Accounts - Costs and expenses by nature, schedule of costs and expenses by nature (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Details of Significant Accounts      
Cost of goods sold $ 3 $ 39 $ 2
Employee benefit expenses 27,956 27,300 23,472
Promotional fees 9,565 7,517 10,841
Platform fees 8,708 5,518 4,286
Professional service fees 6,888 8,537 3,753
Insurance expenses 2,102 459 82
Warranty cost 677 897 734
Depreciation of right-of-use assets 441 456 389
Depreciation of property, plant and equipment 197 247 209
Amortization of intangible assets 75 63 47
Listing expense 0 65,264 0
Others 2,553 2,077 1,982
Total operating costs and operating expenses $ 59,165 $ 118,374 $ 45,797