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Equity - Share options, range of exercise prices (Details) | Dec. 31, 2018 USD ($) shares year | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
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Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options outstanding (in shares) | shares | 5,133,461 | 4,828,173 | 5,537,729
Weighted average remaining contractual life (years) | year | 4.5 |  |
Weighted average exercise price of share options outstanding (usd per share) | $ 2.34 | $ 2.01 | $ 1.84
Number options exercisable (in shares) | shares | 2,455,095 |  |
Weighted average exercise price of share options exercisable (usd per share) | $ 1.98 |  |
$0.83 - $1.19 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options outstanding (in shares) | shares | 208,167 |  |
Weighted average remaining contractual life (years) | year | 1.2 |  |
Weighted average exercise price of share options outstanding (usd per share) | $ 0.90 |  |
Number options exercisable (in shares) | shares | 208,167 |  |
Weighted average exercise price of share options exercisable (usd per share) | $ 0.90 |  |
$0.83 - $1.19 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 0.83 |  |
$0.83 - $1.19 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 1.19 |  |
$1.23 - $1.96 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options outstanding (in shares) | shares | 1,689,154 |  |
Weighted average remaining contractual life (years) | year | 4.6 |  |
Weighted average exercise price of share options outstanding (usd per share) | $ 1.64 |  |
Number options exercisable (in shares) | shares | 736,818 |  |
Weighted average exercise price of share options exercisable (usd per share) | $ 1.51 |  |
$1.23 - $1.96 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 1.23 |  |
$1.23 - $1.96 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 1.96 |  |
$2.00 - $2.74 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options outstanding (in shares) | shares | 1,994,924 |  |
Weighted average remaining contractual life (years) | year | 3.9 |  |
Weighted average exercise price of share options outstanding (usd per share) | $ 2.39 |  |
Number options exercisable (in shares) | shares | 1,441,920 |  |
Weighted average exercise price of share options exercisable (usd per share) | $ 2.32 |  |
$2.00 - $2.74 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 2.00 |  |
$2.00 - $2.74 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 2.74 |  |
$2.80 - $3.74 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options outstanding (in shares) | shares | 1,241,216 |  |
Weighted average remaining contractual life (years) | year | 6.0 |  |
Weighted average exercise price of share options outstanding (usd per share) | $ 3.48 |  |
Number options exercisable (in shares) | shares | 68,190 |  |
Weighted average exercise price of share options exercisable (usd per share) | $ 3.21 |  |
$2.80 - $3.74 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 2.80 |  |
$2.80 - $3.74 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 3.74 |  |

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