The following table summarizes segment reporting. The sum of the amounts of the two segments equals the total for the Group in each of the periods.
| Quarter Ended December 31, (unaudited) | Year Ended December 31, | |||||||||
| 2017 | 2016 | 2017 | 2016 | |||||||
| (€ in thousands, except gross profit margin) | ||||||||||
| Revenues | ||||||||||
| Systems | 3,146 | 3,934 | 11,534 | 13,081 | ||||||
| Services | 2,962 | 2,341 | 11,644 | 9,257 | ||||||
| Total revenues | 6,108 | 6,275 | 23,178 | 22,338 | ||||||
| Cost of sales | ||||||||||
| Systems | (2,087) | (3,555) | (7,613) | (9,884) | ||||||
| Services | (1,575) | (1,466) | (6,211) | (5,551) | ||||||
| Total cost of sales | (3,662) | (5,021) | (13,824) | (15,435) | ||||||
| Gross profit | ||||||||||
| Systems | 1,059 | 379 | 3,921 | 3,197 | ||||||
| Services | 1,387 | 875 | 5,433 | 3,706 | ||||||
| Total gross profit | 2,446 | 1,254 | 9,354 | 6,903 | ||||||
| Gross profit margin (%) | ||||||||||
| Systems | 33.7% | 9.6% | 34.0% | 24.4% | ||||||
| Services | 46.8% | 37.4% | 46.7% | 40.0% | ||||||
| Total gross profit margin (%) | 40.0% | 20.0% | 40.4% | 30.9% | ||||||
