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Investments (Tables) | 6 Months Ended
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Jun. 30, 2019
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Summary of Investments | Investments as of June 30, 2019 and December 31, 2018 consisted of the following:
|  | Balance as per |
|  | June 30, 2019 |  |  | December 31, 2018 |
|  | (euros in thousands) |
Commercial paper |  |  | 13,929 |  |  |  | 22,208 |
U.S. Treasury securities |  |  | 2,411 |  |  |  | 6,733 |
Corporate fixed income bonds |  |  | 17,465 |  |  |  | 14,185 |
Agency bonds |  |  | 1,755 |  |  |  | 1,729 |
Current investments |  |  | 35,560 |  |  |  | 44,855 |
Corporate fixed income bonds |  |  | 12,319 |  |  |  | 16,945 |
Non-current investments |  |  | 12,319 |  |  |  | 16,945 |
Total investments |  |  | 47,879 |  |  |  | 61,800 |

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