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Equity - Share options, rollforward (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares
Share-Based Payment Arrangements [Abstract] |  |
Options Outstanding (in shares) | shares | 4,828,173 | 5,537,729
Options granted (in shares) | shares | 1,675,640 | 1,498,776
Options exercised (in shares) | shares | (945,022) | (1,820,193)
Options forfeited (in shares) | shares | (400,663) | (277,839)
Options expired (in shares) | shares | (24,667) | (110,300)
Options Outstanding (in shares) | shares | 5,133,461 | 4,828,173
Weighted average exercise price of share options outstanding (usd per share) | $ | $ 2.01 | $ 1.84
Weighted average exercise price of share options granted (usd per share) | $ | 3.27 | 2.21
Weighted average exercise price of share options exercised (usd per share) | $ | 1.66 | 1.99
Weighted average exercise price of share options forfeited (usd per share) | $ | 2.22 | 1.91
Weighted average exercise price of share options expired (usd per share) | $ | 1.35 | 2.31
Weighted average exercise price of share options outstanding (usd per share) | $ | $ 2.34 | $ 2.01

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