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Related party transactions - Key Management Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Related Party [Abstract]
Maximum obligation, notice period	12 months
Maximum obligation, notice period per each year	1 month
Number of years due to change in control	2 years
Payment equivalent period	24 months
Salaries and employee benefits	$ 2,869	$ 3,420
Post-employment retirement benefits	49	52
Termination benefits	12	516
Share-based compensation (note 20)	1,353	1,749
Key management personnel compensation	$ 4,283	$ 5,737

X

- Definition

Key Management Personnel Compensation, Due To Change In Control, Payment Equivalent Period

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- Definition

Key Management Personnel Compensation, Maximum Obligation Notice, Period

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- Definition

Key Management Personnel Compensation, Maximum Obligation Notice, Period Per Each Year

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- Definition

Key Management Personnel Compensation, Number Of Years Due To Change In Control

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Related Party [Abstract]

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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2017-01-01
-Paragraph 17
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- Definition

The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
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-Paragraph 17
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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 24
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- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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-Name IAS
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- Definition

The amount of compensation to key management personnel in the form of termination benefits. [Refer: Termination benefits expense; Key management personnel of entity or parent [member]]

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