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Management of Financial Risks - Additional Information (Detail) - EUR (€) € in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure Of Financial Risk Management [line items] |  |  |  |
Cash and cash equivalents | € 137,880 | € 256,473 | € 323,381 | € 114,555
Operating losses and cash out flows from operation | (147,693) | (114,531) | (44,674) |
Accumulated deficit and reserves | (279,300) |  |  |
Net cash used in operating activities | € (114,314) | € (59,538) | € (26,763) |
Top of range [member] |  |  |  |
Disclosure Of Financial Risk Management [line items] |  |  |  |
Percentage of purchases and other external expenses made in U.S. dollars | 12.00% | 12.00% | 12.00% |

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