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Basis of presentation and consolidation and significant accounting policies (Tables)
 9 Months Ended
Sep. 30, 2022
Accounting Policies [Abstract]  
Schedule of assets and liabilities that are measured at fair value on a recurring basis
As of September 30, 2022 and December 31, 2021, information about inputs into the fair value measurement of the Company’s assets that are measured at a fair value on a recurring basis in periods subsequent to their initial recognition is as follows (in thousands):
DescriptionFair Value as of
September 30, 2022
$
Fair Value Measurement at Reporting
Date Using Quoted Prices in Active
Markets
for Identical
Assets (Level 1)
US$
Equity Investments with Readily Determinable Fair Value 3,316 3,316 
DescriptionFair Value as of
December 31, 2021
$
Fair Value Measurement at Reporting
Date Using Quoted Prices in Active
Markets
for Identical
Assets (Level 1)
US$
Equity Investments with Readily Determinable Fair Value 15,383 15,383