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Consolidated Statements of Cash Flows - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of cash flows [abstract]      
Net (loss) for the period € (147,693) € (114,531) € (44,674)
Reconciliation of the net (loss) and the cash used for operating activities:      
Amortization and provision 2,926 1,349 1,073
Retirement pension obligations 230 115 125
Expenses related to share-based payments 30,781 34,353 10,419
Other elements 130 147 296
Operating cash flows before change in working capital (113,626) (78,566) (32,761)
Inventories     124
Customer accounts receivable 3 (1,250) 136
Other current assets (3,458) (2,931) (4,870)
Supplier accounts payable 3,333 3,645 8,236
Other current and non-current liabilities (566) 19,564 2,372
Change in working capital requirement (687) 19,028 5,998
Net cash flow used in operating activities (114,314) (59,538) (26,763)
Cash flows used in investing activities:      
Acquisitions of property, plant, and equipment (7,246) (7,992) (4,360)
Acquisitions of intangible assets (299) (215) (148)
Acquisitions of non-current financial assets (289) (93) (839)
Net cash flows used in investing activities (7,834) (8,300) (5,347)
Cash flows provided by financing activities:      
Increase in conditional advances     865
(Decrease) in conditional advances (578) (275) (192)
Treasury shares (25) (54) (175)
Capital increases, net of transaction costs 861 2,016 240,538
Other cash flows related to financing activities 28 (21) (21)
Net cash flows provided by financing activities 286 1,666 241,014
(Decrease) / Increase in cash (121,863) (66,172) 208,904
Net Cash and cash equivalents at the beginning of the period 256,473 323,381 114,555
Impact of exchange rate fluctuations 3,269 (735) (78)
Net cash and cash equivalents at the close of the period € 137,880 € 256,473 € 323,381