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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, 2021
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 | 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] |  |  |  |
Interest on withheld tax |  |  |  | $ 55,000
Repayment of loans to related party | $ 3,883,000 |  |  |
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 |

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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=123570139&loc=d3e3291-108585 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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