|
The following tables list the inputs to the models used for deriving the fair value of the stock options granted for the years ended December 31, 2015, 2016 and 2017 |
| Grant dates | ||||||||
| 2015 | 2017 | |||||||
| February 4 | July 18 | |||||||
|
Dividend yield |
0.0 | % | 0.0 | % | ||||
|
Expected volatility |
56 | % | 44.9-45.7 | % | ||||
|
Risk-free interest rate |
0.0 | % | (0.04)-0.00 | % | ||||
|
Expected life of stock options (years) |
6 | 5.5-7 | ||||||
|
Exercise price (yen) |
1,320 | 4,206 | ||||||
|
Fair value per common share at the grant date (yen) |
4,225 | 3,840 | ||||||
|
Model used |
Black-Scholes | Black-Scholes | ||||||