in € thousand | 2015 | 2016 | 2017 | |||
Third-party services | 1,960 | 3,757 | 8,856 | |||
Personnel expenses | 1,153 | 1,293 | 4,681 | |||
Legal and consulting fees | 77 | 95 | 643 | |||
Cost of materials | 52 | 27 | 55 | |||
Other expenses | 236 | 105 | 181 | |||
Research and development expenses | 3,478 | 5,278 | 14,415 |