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Related party transactions - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2014 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |
Repayment of loans to related party |  |  | $ 662,000 |  |  |
Treasury stock [Member] |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |
Interest on withheld tax price |  |  |  | 5.00% |  |
Aiden & Jasmine Limited |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |
Withholding Tax Payable Non-current |  |  | 91,000 |  | $ 17,000 | $ 54,000
Aiden & Jasmine Limited | Treasury stock [Member] |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |
Shares repurchased |  |  |  | 3,860,733 |  |
Shares repurchased, value |  |  |  | $ 10,879,000 |  |
Interest on withheld tax |  |  |  | 363,000 |  |
Withholding Tax Payable Non-current |  |  |  | $ 1,451,000 |  |
Vantage Point Global Limited |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |
Withholding Tax Payable Non-current | [1] |  | $ 243,000 |  | $ 46,000 | $ 146,000
Vantage Point Global Limited | Treasury stock [Member] |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |
Shares repurchased |  |  |  | 10,334,679 |  |
Shares repurchased, value |  |  |  | $ 29,121,000 |  |
Interest on withheld tax |  |  |  | 971,000 |  |
Withholding Tax Payable Non-current |  |  |  | $ 3,883,000 |  |
Vantage Point Global Limited | Subsequent event |  |  |  |  |  |
Schedule of Other Related Party Transactions [Line Items] |  |  |  |  |  |
Repayment of loans to related party |  | $ 3,883,000 |  |  |  |
[1] | In 2014, the Group repurchased 3,860,733 common shares from Aiden & Jasmine Limited (Co founder’s company) for USD10,879,000 and 10,334,679 common shares from Vantage Point Global Limited for USD29,121,000. According to the repurchase contract, the Company was entitled to an amount (the “Withheld Price”) to withhold any taxes with respect to this repurchase as required under the applicable laws. If the Seller has not been specifically required by the applicable governmental or regulatory authority to pay any taxes as required under the applicable laws in connection with the repurchase, after the fifth anniversary of the Closing Date, the Company will pay to the Seller the Withheld Price with a simple interest thereon at the rate of five percent (5%) per annum from the Closing Date. Therefore, the Withheld Price for Aiden & Jasmine Limited and Vantage Point Global Limited was USD 1,451,000 (including interest of USD 363,000) and USD 3,883,000 (including interest of USD 971,000) respectively. The interest accrued for the year ended December 31, 2020 was USD 91,000 and USD 243,000 for Aiden & Jasmine Limited and Vantage Point Global Limited respectively.

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- Definition The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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