Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Statement of Cash Flows [Abstract]
Net loss for the period	$ (90,903)	$ (61,540)
Adjustments to reconcile net loss to net cash flow provided by (used in) operating activities:
Depreciation, amortization and accrued contingencies	(1,563)	(3,072)
Retirement pension obligations	87	58
Expenses related to share-based payments	5,073	4,800
Other elements	582	23
Changes in operating assets and liabilities:
Decrease (increase) in other current assets	(4,153)	(5,850)
(Decrease) increase in trade payables	(1,090)	1,691
(Decrease) increase in other current and non-current liabilities	(1,225)	(2,547)
Change in operating lease liabilities and right of use assets	970	471
Net cash flow provided by (used in) operating activities	(92,222)	(65,967)
Cash flows provided by (used in) investing activities :
Acquisitions of property, plant, and equipment	(2,463)	(325)
Proceeds from property, plant, and equipment dispositions	0	0
Acquisitions of non-current financial assets	(171)	(54)
Proceeds of non-current financial assets dispositions	1,084	(242)
Net cash flows provided by (used in) investing activities	(1,550)	(621)
Cash flows provided by (used in) financing activities :
(Decrease) increase in conditional advances	0	0
Treasury shares	(88)	54
Capital increases, net of transaction costs	0	6,902
Net cash flows provided by (used in) financing activities	(88)	6,956
Effect of exchange rate changes on cash and cash equivalents	(1,065)	(427)
Net increase (decrease) in cash and cash equivalents	(94,925)	(60,059)
Net Cash and cash equivalents at the beginning of the period	141,367	209,194
Net cash and cash equivalents at the end of the period	$ 46,441	$ 149,135