Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Net loss for the period	$ (72,726)	$ (96,274)
Cash flows used in operating activities:
Depreciation, amortization and accrued contingencies	(13,998)	13,162
Retirement pension obligations	76	105
Expenses related to share-based payments	6,019	5,026
Other elements	23	(7)
Changes in operating assets and liabilities:
Decrease (increase) in inventories and work in progress	0	0
Decrease (increase) in trade receivables	0	0
Decrease (increase) in other current assets	(3,795)	20,961
(Decrease) increase in trade payables	8,420	3,456
(Decrease) increase in other current and non-current liabilities	(5,334)	152
Change in operating lease liabilities and right of use assets	1,662	(2,249)
Net cash flow used in operating activities	(79,653)	(55,666)
Cash flows used in investing activities:
Acquisitions of property, plant, and equipment	(677)	(754)
Proceeds from property, plant, and equipment dispositions	0	8
Acquisitions of intangible assets	0	0
Acquisitions of non-current financial assets	(285)	(123)
Proceeds from non-current financial assets dispositions	154	770
Net cash flows used in investing activities	(808)	(100)
Cash flows provided by financing activities:
(Decrease) increase in conditional advances	0	(474)
Treasury shares	(154)	123
Capital increases, net of transaction costs	6,921	194,471
Other cash flows related to financing activities	0	0
Net cash flows provided by financing activities	6,767	194,120
Effect of exchange rate changes on cash and cash equivalents	5,867	(6,461)
Net (decrease) / increase in cash and cash equivalents	(67,827)	131,893
Net cash and cash equivalents at the beginning of the period	209,194	77,301
Net cash and cash equivalents at the end of the period	$ 141,367	$ 209,194