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Related party transactions - Schedule of Amount Due to from Related Party (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Other Related Party Transactions [Line Items] |  |
Accounts payable to related party | $ 5,389 | $ 5,002
Accounts and other receivable from related party | 10,970 | 1,658
Guangzhou Millet |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Accounts and other receivable from related party | 1,456 | 1,361
Xiaomi Technology |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Accounts and other receivable from related party | 576 | 262
Due from Other Related Parties, Current | 15 | 14
Itui Online |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Accounts and other receivable from related party | 1,153 |
Beijing Itui |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Accounts and other receivable from related party | 7,689 |
Shenzhen Xiaomi Technology Co., Ltd. |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Accounts and other receivable from related party | 60 |
Shenzhen Crystal Technology Co., Ltd. |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Due from Other Related Parties, Current | 6 | 6
Shenglong Zou |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Due from Other Related Parties, Current | 9 | 9
Chuan Wang |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Due from Other Related Parties, Current | 6 | 6
Investee companies |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Accounts payable to related party | 55 | 2
Vantage Point Global Limited |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Due to Other Related Parties, Current | 3,883 | 3,640
Aiden & Jasmine Limited |  |
Schedule of Other Related Party Transactions [Line Items] |  |
Due to Other Related Parties, Current | $ 1,451 | $ 1,360

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