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Year ended December 31, |
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2015 |
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2016 |
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2017 |
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Weighted average fair value at grant date (in USD) |
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|
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|
8.08 |
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|
|
|
7.18 |
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|
|
|
39.15 |
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The parameters used to calculate fair value: |
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Share price (on grant date) (weighted average) (in USD) |
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|
|
|
17.26 |
|
|
|
|
16.47 |
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|
|
|
57.43 |
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Exercise price (weighted average) (in USD) |
|
|
|
|
15.50 |
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|
|
|
16.61 |
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|
|
|
53.56 |
|
|
Expected volatility (weighted average) |
|
45 |
% |
- |
58 |
% |
42 |
% |
- |
56 |
% |
42 |
% |
- |
48 |
% |
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Option life (years) |
|
|
|
|
5 |
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|
|
5 |
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|
|
5 |
|
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Expected dividends |
|
|
|
|
0 |
% |
|
|
|
0 |
% |
|
|
|
0 |
% |
|
Risk-free interest rate |
|
0.38 |
% |
- |
1.72 |
% |
0.47 |
% |
- |
1.38 |
% |
1.10 |
% |
- |
2.06 |
% |