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Cash and cash equivalents - Summary of Cash on Hand and Cash Held at Bank (Details) ฿ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 HKD ($)	Dec. 31, 2020 THB (฿)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 HKD ($)	Dec. 31, 2019 THB (฿)
Cash and Cash Equivalents [Line Items]
Cash on hand and cash held at bank	$ 137,248				$ 162,465
RMB [Member]
Cash and Cash Equivalents [Line Items]
Cash on hand and cash held at bank	47,906	¥ 312,581			46,296	¥ 322,972
USD [Member]
Cash and Cash Equivalents [Line Items]
Cash on hand and cash held at bank	89,050				115,805
HKD [Member]
Cash and Cash Equivalents [Line Items]
Cash on hand and cash held at bank	224		$ 1,737		283		$ 2,202
THB [Member]
Cash and Cash Equivalents [Line Items]
Cash on hand and cash held at bank	$ 68			฿ 2,052	$ 81			฿ 2,417

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

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 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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