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Long-term investments - Schedule of Long-Term Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cost method investments:
Balance at beginning of the year	$ 26,734	$ 26,734	$ 26,365
Additions	4,627	0
Net unrealized gains on investments held		794
Exchange difference	134	369
Less: Impairment loss on long-term investments		(794)
Balance at end of the year	$ 31,495	$ 26,734	$ 26,734

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- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

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- Definition

This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=SL6284393-111563

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- Definition

This element represents disclosure of the amount of gain which has been deferred as the result of the sale of a business or operating assets to a highly leveraged entity under cost method which deferred gain has been reflected in the accompanying statement of financial position as reduction from the related asset.

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No definition available.

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- Definition

Cost Method Investments Additions

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- Definition

Increase decrease in cost method investment due to foreign currency translation adjustment.

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No definition available.

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