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Employee benefits (Details 7) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Actuarial assumption of discount rates [member]
Employee benefits [Line Items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ (1,796)	$ (1,807)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	2,021	2,033
Actuarial assumption of employee turnover rate [Member]
Employee benefits [Line Items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	(236)	(237)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 263	$ 265

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 145
-Subparagraph a
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-URIDate 2019-03-27

+ Details

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X

- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 19
-IssueDate 2019-01-01
-Paragraph 145
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-URIDate 2019-03-27

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- References

No definition available.

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- Details

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