Loss per common share is calculated by dividing the loss of the period by the weighted average number of common shares outstanding during the period.
| 2015 | 2016 | 2017 | ||||||||||
| Net loss | (20,239 | ) | (32,216 | ) | (30,223 | ) | ||||||
| Weighted number of common shares outstanding | 28,477,438 | 33,259,505 | 43,746,073 | |||||||||
| Loss per share in € per share | (0.71 | ) | (0.97 | ) | (0.69 | ) | ||||||
No instruments had a dilutive effect.