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Fair value measurements - Schedule of financial instruments measured at fair value (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total	$ 53,273	$ 48,993
Investments in financial instruments [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Investments in structured deposits and wealth management products	53,273	48,993
Significant other observable inputs (Level 2) [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Total	53,273	48,993
Significant other observable inputs (Level 2) [Member] | Investments in financial instruments [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Investments in structured deposits and wealth management products	$ 53,273	$ 48,993

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]

+ References

No definition available.

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