Operating Expense (Tables)

12 Months Ended

Dec. 31, 2019

Operating Expense [Abstract]

Summary of Operating Expenses and Other Operating Income

							Contracted
							research &												Gain /
Operating expenses and other operating				Raw			development activities						Other expenses			Depreciation,			(loss) on disposal of
income (expenses) (in thousands of	Year ended			materials& consumables			conducted by third			Employee			(maintenance, fees, travel,			amortization & impairment			plant & property,
euros)	2017/12/31			used			parties			expenses			taxes)			charges			equipment
Research and development expenses		(54,189	)		(2,117	)		(35,088	)		(7,915	)		(7,973	)		(1,095	)		—
General and administrative expenses		(9,421	)		(112	)		(7	)		(5,491	)		(3,374	)		(437	)		—
Other operating income (expenses)	60			—			—			—				68		—				(8	)
TOTAL		(63,550	)		(2,229	)		(35,095	)		(13,406	)		(11,280	)		(1,532	)		(8	)

	Of which:
							Contracted												Gain /
				Raw			research and						Other			Depreciation,			(loss) on
				materials			development						expenses			amortization			disposal of
				and			activities						(maintenance,			and			property,
Operating expenses and other operating income (expenses)	Year ended			consumables			conducted by			Employee			fees, travel,			impairment			plant and
(in € thousands)	2018/12/31			used			third parties			expenses			taxes…)			charges			equipment
Research and development expenses		(67,024	)		(1,724	)		(47,659	)		(9,431	)		(6,502	)		(1,707	)		—
General and administrative expenses		(9,076	)		(126	)		(2	)		(3,778	)		(5,451	)		283			—
Marketing and market access expenses		(717	)		(4	)		—			(416	)		(287	)		(11	)		—
Other operating income and (expenses)		(162	)		—			—			—			(164	)		—			2
TOTAL		(76,979	)		(1,855	)		(47,662	)		(13,625	)		(12,403	)		(1,435	)		2

	Of which:
							Contracted												Gain /
				Raw			research and						Other			Depreciation,			(loss) on
				materials			development						expenses			amortization			disposal of
				and			activities						(maintenance,			and			property,
Operating expenses and other operating income (expenses)	Year ended			consumables			conducted by			Employee			fees, travel,			impairment			plant and
(in € thousands)	2019/12/31			used			third parties			expenses			taxes…)			charges			equipment
Research and development expenses		(66,170	)		(2,017	)		(41,509	)		(11,740	)		(6,188	)		(4,716	)		—
General and administrative expenses		(17,265	)		(177	)		(59	)		(7,598	)		(8,972	)		(458	)		—
Marketing and market access expenses		(13,708	)		(8	)		(0	)		(1,645	)		(11,979	)		(76	)		—
Other operating income (expenses)		(1,649	)		—			—			—			(1,668	)		—			19
TOTAL		(98,793	)		(2,202	)		(41,568	)		(20,984	)		(28,807	)		(5,251	)		19

Summary of Employee Expenses and Number of Employees

Employee expenses and number of employees were as follows:

Employee expenses	Year ended
(in € thousands)	2017/12/31			2018/12/31			2019/12/31
Wages and salaries		(9,267	)		(9,012	)		(14,018	)
Social security costs		(3,996	)		(3,722	)		(5,171	)
Changes in pension provision		135			(104	)		(138	)
Individual training entitlement		—			—			—
Share-based compensation		(278	)		(787	)		(1,657	)
TOTAL		(13,406	)		(13,625	)		(20,984	)

	Year ended
Number of employees at year-end - detail	2017/12/31		2018/12/31		2019/12/31
Average number of employees		123		135		175
Average age of employees	38 years 4 months		38 years 11 months		37 years 1 month
Number of employees
Research and development		77		84		108
Services related to research and development		15		16		19
Administration and management		33		48		60
Marketing and commercial		—		—		7
TOTAL		125		148		194
Number of employees
Senior staff		92		115		144
Staff		29		30		45
Others (apprentices)		4		3		5
TOTAL		125		148		194
Number of employees
Male		45		57		78
Female		80		91		116
TOTAL		125		148		194