SHARE CAPITAL - Fair value measurement assumptions (Details)	12 Months Ended
Dec. 31, 2017 USD ($) Y	Dec. 31, 2016 USD ($) Y	Dec. 31, 2015 USD ($) Y
SHARE CAPITAL
Weighted average share price at the date of exercise for share options exercised	$ 0.87	$ 4.72	$ 6.98
Compensation expense	2,484,543	1,810,111	4,114,165
Weighted average fair value	1.49	3.02	4.85
Weighted average exercise price	1.90	4.90	8.57
Weighted average share price at grant	$ 1.90	$ 4.90	$ 8.57
Dividend yield	0.00%	0.00%	0.00%
Volatility (as a percent)	110.00%	76.00%	76.00%
Risk-free interest rate (as a percent)	1.12%	0.75%	0.75%
Expected life (in years) \| Y	5	5	5
Forfeiture rate (as a percent)	6.00%	1.00%	1.00%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The option life of share options granted.

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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]]

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The exercise price of share options granted.

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- Definition

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

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- Definition

The amount of expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 51
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- Definition

The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
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The weighted average share price. [Refer: Weighted average [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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The forfeiture rate of the share options used to calculate the fair value of the share options granted.

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