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Employee benefits (Details 7) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Actuarial assumption of discount rates [member]
Employee benefits [Line Items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ (1,807)	$ (1,991)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	2,033	2,436
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	(237)	(252)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 265	$ 281

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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
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-IssueDate 2018-01-01
-Paragraph 145
-Subparagraph a
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-URIDate 2018-03-16

+ 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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X

- References

No definition available.

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- Details

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