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RELATED PARTY TRANSACTIONS - Outstanding Balances and Transactions with Related Parties (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties $ 11,018 $ 13,965  
Amounts due to related parties 16,613 11,865  
PEWC      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 147 24  
Amounts due to related parties 14,814 10,075  
Contract liabilities 137 0  
Purchases 24,914 20,359 $ 5,742
Sales 0 5,254 90
Fabrication income received 0 25 0
Construction income received 3 0 0
Management fee paid 172 153 133
Information technology service fee paid 120 113 123
Training fee paid 0 110 0
Interest expenses paid 0 91 60
Rental fee paid 18 0 0
Materials purchased for interior office redecorating 8 0 0
Management fee received 10 0 0
PEWC, Singapore Branch      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 5 21  
Management fee received 0 14 14
PEWC (HK)      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 4,177 7,204  
Amounts due to related parties 26 16  
Sales 18,309 25,127 17,004
Service fee paid 156 219 209
Taiwan Submarine Cable Co., Ltd      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 65 0  
SPHC      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 170 176  
Amounts due to related parties 1,362 1,362  
Italian-Thai and its affiliates      
Disclosure of transactions between related parties [Line Items]      
Amounts due from related parties 6,454 6,540  
Sales 8,772 6,613 5,344
Construction of factory building expenses 0 1,651 3,436
PEWC Singapore Co. (Pte) Ltd.      
Disclosure of transactions between related parties [Line Items]      
Amounts due to related parties 400 400  
Interest expenses paid 0 0 12
Others      
Disclosure of transactions between related parties [Line Items]      
Amounts due to related parties 11 12  
Fabrication cost $ 277 $ 350 $ 238