Share capital - Weighted average assumptions (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Share capital [Abstract]
Annualized volatility	74.00%	74.00%
Risk-free interest rate	1.31%	0.60%
Life of options in years	6.6	4
Estimated forfeiture rate, share options granted	25.50%	16.90%
Expected dividend as percentage, share options granted	0.00%	0.00%
Exercise price, share options granted	$ 4.12	$ 2.68
Market price on date of grant, share options granted	$ 4.12	$ 2.68
Share options granted, fair value	$ 2.79	$ 1.47

Estimated forfeiture rate, share options granted

No definition available.

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- Definition

Market price on date of grant, share options granted

+ References

No definition available.

+ Details

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- Definition

Share capital [Abstract]

+ References

No definition available.

+ Details

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- Definition

Share options granted, fair value

+ References

No definition available.

+ Details

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- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard
-URIDate 2017-03-09

+ Details

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- Definition

The option life of share options granted.

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+ Details

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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

+ Details

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Period Type:	duration

- Definition

The exercise price of share options granted.

+ References

+ Details

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- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

+ References

+ Details

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