v3.25.4
Bank and other Loans and Banking Facilities - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Aug. 31, 2024
Jun. 30, 2024
May 31, 2024
Aug. 31, 2023
Aug. 31, 2021
Feb. 29, 2020
Oct. 31, 2019
Sep. 30, 2019
Aug. 31, 2019
Debt Instrument [Line Items]                            
Bank borrowings $ 8,580,000     $ 89,140,000 $ 72,330,000                  
Repayments of principal 18,070,000.00 $ 15,570,000 $ 4,960,000 30,900,000 54,870,000                  
Line of credit financing cost 0 0 0 0 276,000                  
Assets pledged to banks 233,800,000 235,800,000 242,800,000 255,500,000 $ 277,800,000                  
Zastron Shenzhen | Shenzhen Rural Commercial Bank | Nam Tai Inno Valley                            
Debt Instrument [Line Items]                            
Line of credit, current 8,580,000                          
Line of credit, maximum borrowing capacity $ 1,400,000                          
Wuxi Zastron Flex [Member] | Zastron Shenzhen                            
Debt Instrument [Line Items]                            
Line of credit facility               14.76%            
Line of credit, current               $ 4,920,000            
Nam Tai Dongguan Real Estate Development Co Ltd [Member]                            
Debt Instrument [Line Items]                            
Line of credit facility             12.00%              
Line of credit, current             $ 2,810,000              
Nam Tai Investment (Shenzhen) Co., Ltd. | Zastron Shenzhen                            
Debt Instrument [Line Items]                            
Line of credit facility 9.00%         7.00%     5.00%          
Line of credit, current                 $ 6,270,000          
Nam Tai Investment (Shenzhen) Co., Ltd. | Nam Tai Inno Valley                            
Debt Instrument [Line Items]                            
Line of credit facility           13.20%                
Line of credit, current           $ 8,440,000                
Nam Tai Investment (Shenzhen) Co., Ltd. | Bank of Guangzhou | Nam Tai Technology Center                            
Debt Instrument [Line Items]                            
Repayments of principal $ 8,090,000.00 8,170,000                        
Line of credit, current                   $ 89,140,000        
Line of credit, maximum borrowing capacity                   $ 164,000,000        
Nam Tai Investment (Shenzhen) Co., Ltd. | Bank of Beijing                            
Debt Instrument [Line Items]                            
Repayments of principal       500,000                    
Line of credit, current                           $ 7,160,000
Line of credit, maximum borrowing capacity                           7,160,000
Line of credit financing cost                           $ 290,000
Nam Tai Investment (Shenzhen) Co., Ltd. | Shenzhen Rural Commercial Bank | Nam Tai Inno Valley                            
Debt Instrument [Line Items]                            
Line of credit, maximum borrowing capacity 14,060,000.00                          
Zastron Electronic (Shenzhen) Co., Ltd. (Zastron Shenzhen) | Bank of China | Nam Tai Inno Park                            
Debt Instrument [Line Items]                            
Repayments of principal $ 9,990,000 $ 7,410,000 $ 4,960,000 23,150,000                    
Line of credit, maximum borrowing capacity                         $ 143,000,000  
Zastron Electronic (Shenzhen) Co., Ltd. (Zastron Shenzhen) | Xiamen International Bank | Nam Tai Inno Park                            
Debt Instrument [Line Items]                            
Repayments of principal       480,000                    
Line of credit, maximum borrowing capacity                     $ 15,950,000      
Debt Instrument, Face Amount                     $ 15,950,000      
Nam Tai (Shenzhen) Technology Park Operations Management Co., Ltd ("NTTP") | Industrial Bank | Nam Tai Inno Valley                            
Debt Instrument [Line Items]                            
Repayments of principal       $ 290,000                    
Line of credit, current                       $ 4,300,000    
Line of credit, maximum borrowing capacity                       4,300,000    
Line of credit financing cost                       $ 170,000