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Related party transactions - Schedule of Amount Due to from Related Party (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule of Other Related Party Transactions [Line Items]    
Accounts payable to related party $ 5,002 $ 5,234
Accounts and other receivable from related party 1,658 1,137
Zhuhai Qianyou [Member]    
Schedule of Other Related Party Transactions [Line Items]    
Accounts payable to related party 2 2
Guangzhou Millet [Member]    
Schedule of Other Related Party Transactions [Line Items]    
Accounts payable to related party 0 295
Accounts and other receivable from related party 1,361  
Aiden & Jasmine Limited [Member]    
Schedule of Other Related Party Transactions [Line Items]    
Due to Other Related Parties, Current 1,360 1,343
Vantage Point Global Limited [Member]    
Schedule of Other Related Party Transactions [Line Items]    
Due to Other Related Parties, Current 3,640 3,594
Beijing Xiaomi Mobile Software Co., Ltd. [Member]    
Schedule of Other Related Party Transactions [Line Items]    
Accounts and other receivable from related party   783
Beijing Millet Payment Technologies Limited [Member]    
Schedule of Other Related Party Transactions [Line Items]    
Accounts and other receivable from related party   175
Xiaomi Technology [Member]    
Schedule of Other Related Party Transactions [Line Items]    
Accounts and other receivable from related party 262 143
Due from Other Related Parties, Current 14 15
Shenzhen Crystal Technology Co., Ltd. [Member]    
Schedule of Other Related Party Transactions [Line Items]    
Due from Other Related Parties, Current 6 6
Shenglong Zou [Member]    
Schedule of Other Related Party Transactions [Line Items]    
Due from Other Related Parties, Current 9 9
Chuan Wang [Member]    
Schedule of Other Related Party Transactions [Line Items]    
Due from Other Related Parties, Current $ 6 $ 6