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Cash and cash equivalents - Summary of Cash on Hand and Cash Held at Bank (Details)
฿ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands
Dec. 31, 2019
THB (฿)
Dec. 31, 2019
HKD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
THB (฿)
Dec. 31, 2018
HKD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Cash and Cash Equivalents [Line Items]                
Cash on hand and cash held at bank       $ 162,465       $ 122,930
RMB [Member]                
Cash and Cash Equivalents [Line Items]                
Cash on hand and cash held at bank     ¥ 322,972 46,296     ¥ 247,352 36,040
USD [Member]                
Cash and Cash Equivalents [Line Items]                
Cash on hand and cash held at bank       115,805       85,351
HKD [Member]                
Cash and Cash Equivalents [Line Items]                
Cash on hand and cash held at bank   $ 2,202   283   $ 8,532   1,089
THB [Member]                
Cash and Cash Equivalents [Line Items]                
Cash on hand and cash held at bank ฿ 2,417     $ 81 ฿ 14,624     $ 450