Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2022

Disclosure of terms and conditions of share-based payment arrangement [line items]

Schedule of changes in share capital

			Premiums
		Share	related to	Number of	Nominal
Date	Nature of the transactions	capital	share capital	shares	value
Balance as of January 1st, 2020		268,461	86,011,893	26,846,112	0.01
01/26/2020	Capital increase by issuance of ordinary shares – Vesting of AGAs by Company employees (AGA 2018-2)	633	—	63,300	0.01
02/07/2020	Capital increase by issuance of ordinary shares – Company’s private placement	37,783	14,962,218	3,778,338	0.01
02/07/2020	Transaction costs related to the Company’s private placement	—	(319,564)	—	—
04/17/2020	Appropriation of the issue premium	—	(48,000,000)	—	—
06/28/2020	Capital increase by issuance of ordinary shares – Vesting of AGAs by Company employees (AGA 2019-2)	2,270	—	227,000	0.01
07/15/2020	Capital increase by issuance of ordinary shares – Company’s initial public offering	74,783	94,024,272	7,478,261	0.01
07/15/2020	Transaction costs related to the Company’s initial public offering	—	(7,077,866)	—	—
11/30/2020	Capital increase by emission of ordinary shares – Emission of 10,000 BSA	100	66,650	10,000	0.01
12/14/2020	Capital increase by issuance of ordinary shares – Vesting of AGAs by Company employees (AGA 2018-3)	2,273	—	227,250	0.01
Balance as of December 31, 2020		386,302	139,667,603	38,630,261	0.01
06/28/2021	Capital increase by issuance of ordinary shares – Vesting of AGAs by Company employees (AGA 2019-1)	291	—	29,100	0.01
09/27/2021	Capital increase by issuance of ordinary shares – (ATM)	20,833	25,556,803	2,083,334	0.01
10/01/2021	Capital increase by issuance of ordinary shares – (ATM)	1,309	1,615,584	130,856	0.01
10/01/2021	Transaction costs related to ATM	—	(1,768,424)	—	—
Balance as of December 31, 2021		408,735	165,071,566	40,873,551	0.01
15/06/2022	Capital increase by issue of ordinary shares - (ATM3)	12,606	9,353,504	1,260,618	0.01
15/06/2022	Transaction costs related to ATM	—	(539,404)	—	—
Balance as of December 31, 2022		421,341	173,885,665	42,134,169	0.01

BSPCE and BSA share warrants

Disclosure of terms and conditions of share-based payment arrangement [line items]

Schedule of movements in BSPCE and BSA share warrants and Bonus shares

		Exercise	Outstanding				Outstanding	Number of
		price	at January 1,				at December 31,	shares
Type	Grant date	(in euros)	2022	Issued	Exercised	Forfeited	2022	exercisable
BSPCE — 2013 plan	Dec. 13, 2013	0.59	8,800	—	—	—	8,800	8,800
BSPCE Plan 2021	April 16, 2021	11.74	600,000	—	—	(120,000)	480,000	—
Total BSPCE			608,800	—	—	(120,000)	488,800	8,800
BSA — 2017 plan	May 29, 2017	6.67	130,000	—	—	—	130,000	130,000
BSA — 2018 plan	Dec. 14, 2018	6.07	116,000	—	—	—	116,000	116,000
BSA — 2019 plan	June 28, 2019	2.20	10,000	—	—	—	10,000	10,000
BSA 2019 Bis	March 9, 2020	3.68	10,000	—	—	—	10,000	10,000
BSA 2019 Ter	March 9, 2020	3.68	36,000	—	—	—	36,000	24,000
BSA - Plan 2021-1	April 16, 2021	11.74	20,000	—	—	(4,000)	16,000	—
Total BSA			322,000	—	—	(4,000)	318,000	290,000
Total			930,800	—	—	(124,000)	806,800	298,800

		Exercise	Outstanding				Outstanding	Number of
		price	at January 1,				at December 31,	shares
Type	Grant date	(in euros)	2021	Issued	Exercised	Forfeited	2021	exercisable
BSPCE — 2013 plan	Dec. 13, 2013	0.59	8,800	—	—	—	8,800	8,800
BSPCE Plan 2021	April 16, 2021	11.74	—	600,000	—	—	600,000	—
Total BSPCE			8,800	600,000	—	—	608,800	8,800
BSA — 2017 plan	May 29, 2017	6.67	130,000	—	—	—	130,000	130,000
BSA — 2018 plan	Dec. 14, 2018	6.07	116,000	—	—	—	116,000	116,000
BSA — 2019 plan	June 28, 2019	2.20	10,000	—	—	—	10,000	10,000
BSA 2019 Bis	March 9, 2020	3.68	10,000	—	—	—	10,000	10,000
BSA 2019 Ter	March 9, 2020	3.68	36,000	—	—	—	36,000	12,000
BSA - Plan 2021-1	April 16, 2021	11.74	—	50,000	—	(30,000)	20,000	—
Total BSA			302,000	50,000	—	(30,000)	322,000	278,000
Total			310,800	650,000	—	(30,000)	930,800	286,800

		Exercise	Outstanding				Outstanding	Number of
		price	at January 1,				at December 31,	shares
Type	Grant date	(in euros)	2020	Issued	Exercised	Forfeited	2020	exercisable
BSPCE — 2013 plan	Dec. 13, 2013	0.59	8,800	—	—	—	8,800	8,800
Total BSPCE			8,800	—	—	—	8,800	8,800
BSA — 2017 plan	May 29, 2017	6.67	140,000	—	(10,000)	—	130,000	130,000
BSA — 2018 plan	Dec. 14, 2018	6.07	116,000	—	—	—	116,000	77,334
BSA — 2019 plan	June 28, 2019	2.20	10,000	—	—	—	10,000	10,000
BSA 2019 Bis	March 9, 2020	3.68	—	10,000	—	—	10,000	—
BSA 2019 Ter	March 9, 2020	3.68	—	36,000	—	—	36,000	—
Total BSA			266,000	46,000	(10,000)	—	302,000	217,334
Total			274,800	46,000	(10,000)	—	310,800	226,134

BSPCE Share Warrants [Member]

Disclosure of terms and conditions of share-based payment arrangement [line items]

Schedule of movements in BSPCE and BSA share warrants and Bonus shares

	BSPCE 2013-1		BSPCE 2021
Decision of issuance by the Board of Directors	13/12/2013		04/16/2021
Grant date	13/12/2013		04/16/2021
Beneficiary	3 employees		Executive Directors (Frederic Cren and Pierre Broqua)
Number of BSPCE granted	9 027		600,000
Expiration date	25/01/2024		03/31/2034
Number of shares per BSPCE	100		1
Subscription price (€)	58.50		0
Exercise price (€)	0.585		11.74
Performance condition	No		Partially (1)
Valuation method used	Black and Scholes		Monte Carlo
Fair value at grant date (€)	19		[5.4 – 5.7] (1)
Expected volatility	35	%	64	%
Average life (years)	5		5
Risk-free rate	1.13	%	0.60	%
Expected dividends	—		—

(1) The fair value at grant date is different depending on whether the BSPCEs are subject to market performance conditions.

BSA Share warrant [Member]

Disclosure of terms and conditions of share-based payment arrangement [line items]

Schedule of movements in BSPCE and BSA share warrants and Bonus shares

			BSA				BSA
	BSA 2017		2018-1		BSA 2019		2019 bis		BSA 2019 ter		BSA 2021
Decision of issuance by the Board of Directors	05/29/2017		12/14/2018		06/28/2019		03/09/2020		03/09/2020		04/16/2021
Grant date	05/29/2017		12/14/2018		06/28/2019		03/09/2020		03/09/2020		04/16/2021
Beneficiary	Directors		Service providers		Service providers		Service providers		Service providers		Service providers
Vesting period (year)	3 tranches: 1 year, 2 years and 3 years		between 1 and 3 years		1		1		between 1 and 3 years		3
Expiration date	05/29/2027		12/14/2028		06/28/2029		03/09/2030		03/09/2030		03/31/2034
Number of BSA granted	195,000		126,000		10,000		10,000		36,000		50,000
Number of shares per BSA	1		1		1		1		1		1
Subscription premium price per share (€)	0.534		0.48		0.18		0.29		0.29		2.45
Exercise price per share (€)	6.675		6.067		2.20		3.68		3.68		11.74
Performance condition	No		No		No		No		No		Yes
Valuation method	Black and Scholes										Monte Carlo
Fair value per BSA at grant date (€)	2.47		1.98		0.48		0.90		0.90		[3.0 – 3.2] (1)
Expected volatility	40	%	40	%	40	%	40	%	40	%	64	%
Average life (years)	6		6		5.5		6		6		5
Risk free rate	0.22	%	0.30	%	0.33	%	0.0	%	0.0	%	0.60	%
Expected dividends	—		—		—		—		—		—

(1) The fair value at grant date is different depending on whether the BSPCEs are subject to market performance conditions.

AGA Bonus Share Award Plans Member

Disclosure of terms and conditions of share-based payment arrangement [line items]

Schedule of movements in BSPCE and BSA share warrants and Bonus shares

	AGA 2021		AGA 2021-bis		AGA 2022
Decision of issuance by the Board of Directors	04/16/2021		12/08/2021		12/08/2022
Grant date	04/16/2021		12/08/2021		12/08/2022
Beneficiary	Employees		Employees		Employees
Vesting period (year)	3		3		1
Holding period (year)	—		—		1
Service condition	Yes		Yes		Yes
Performance condition	Partially (1)		Partially (1)		No
Number of AGA granted	466,000		123,000		373,000
Number of shares per AGA	1		1		1
Valuation method used	Dual (1)		Dual (1)		Dual(1)
Fair value per AGA at grant date	[9.8 – 11.3] (1)		[11.4 – 12.2] (1)		4.18
Expected volatility	64	%	64	%	N/A
Average life (years)	3		2.3		N/A
Risk-free rate	0.60	%	0.60	%	N/A
Expected dividends	—		—		–
Stock price reference	N/A		N/A		N/A
Non-transferable discount	N/A		N/A		N/A

(1) AGA 2021-1 and AGA 2021-bis plans are partially composed of AGAs subject to a market performance condition. AGAs 2022 aren’t subject to a market performance condition. Accordingly, AGAs not subject to performance conditions are valued on the basis of the share price less future dividends, discounted at the risk-free rate. AGAs subject to performance conditions are valued using the same method, adjusted by a discount applied to reflect the performance condition. This discount is determined using the “Monte Carlo” analysis. The fair value at the grant date is different depending on whether the AGAs are subject to market performance conditions.

Bonus Share Award Plans [Member]

Disclosure of terms and conditions of share-based payment arrangement [line items]

Schedule of movements in BSPCE and BSA share warrants and Bonus shares

		Stock price	Outstanding				Outstanding	Number of
		at grant date	at January 1,				at December 31,	shares
Type	Grant date	(in euros)	2022	Issued	vesting	Forfeited	2022	exercisable
AGA — 2021‑1 plan	04/16/21	11.30	448,000	—	—	(107,200)	340,800	—
AGA — 2021‑bis plan	12/08/21	12.20	123,000	—	—	(46,200)	76,800	—
AGA —2022 plan	12/08/22	4.18	—	373,000	—	—	373,000	—
Total AGA			571,000	373,000	—	(153,400)	790,600	—

		Stock price					Outstanding
		at grant	Outstanding				at	Number of
		date	at January 1,				December 31,	shares
Type	Grant date	(in euros)	2021	Issued	vesting	Forfeited	2021	exercisable
AGA — 2019‑1 plan	08/28/19	2.00	29,100	—	(29,100)	—	—	—
AGA — 2021‑1 plan	04/16/21	11.30	—	466,000	—	(18,000)	448,000	—
AGA —2021‑bis plan	08/12/21	12.20	—	123,000	—	—	123,000	—
Total AGA			29,100	589,000	(29,100)	(18,000)	571,000	—

		Stock
		price
		at grant	Outstanding				Outstanding	Number of
		date	at January 1,				at December 31,	shares
Type	Grant date	(in euros)	2020	Issued	vesting	Forfeited	2020	exercisable
AGA — 2018-2 plan	January 26, 2018	5.76	63,300	—	(63,300)	—	—	—
AGA — 2018-3 plan	December 14, 2018	6.28	227,250	—	(227,250)	—	—	—
AGA — 2019-1 plan	June 28, 2019	2.00	37,500	—	—	(8,400)	29,100	—
AGA — 2019-2 plan	June 28, 2019	2.00	228,000	—	(227,000)	(1,000)	—	—
Total AGA			556,050	—	(517,550)	(9,400)	29,100	—