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Share Capital (Tables)
12 Months Ended
Dec. 31, 2021
Disclosure Of Share Capital, Reserves And Other Equity Interest [Abstract]  
Disclosure of detail of share capital transactions
Detail of share capital transactions

(in thousands or number of shares)Nature of transactionShare CapitalPremiums related to share capitalNumber of shares
December 31, 2019672 153,139 22,415,039 
March 6, 2020Capital increase 0316,083 
June 24, 2020Subscription of 2020 warrants— — 
June 26, 2020Subscription of 2020 warrants— — 
June 29, 2020Subscription of 2020 warrants— — 
June 30, 2020Subscription of 2020 warrants— — 
July 27, 2020Capital increase— — 6,000 
July 28, 2020Private placement Capital increase99 20,030 3,300,000 
July 28, 2020Private placement Capital increase transaction costs— (1,387)— 
December 16, 2020
U.S. Initial public offering initial deal € - Nasdaq (€11.14)
56 20,609 1,855,000 
December 16, 2020
U.S. Initial public offering initial deal $ - Nasdaq ($13.50)
163 60,494 5,445,000 
December 18, 2020
U.S. Initial public offering green shoe $ - Nasdaq ($13.50)
33 12,165 1,095,000 
December 18, 2020U.S. Initial public offering costs— (9,322)— 
December 31, 20201,033 255,735 34,432,122 
March 31, 2021Capital increase AGA 2018-1— 24,500 
March 31, 2021Capital increase AGA 2019-111 — 369,250 
April 20, 2021Warrants attribution — (11)— 
May 31, 2021Warrants subscription (BSA 2021)— 43 — 
December 31, 20211,045 255,767 34,825,872 
Disclosure of detail of change in founders' warrants, warrants and free shares
The following tables summarize activity in these plans during the years ended December 31, 2021 and 2020.

Founders’ warrants (BSPCE)
TypeGrant
date
Exercise
price
(in euros)
Outstanding
at January 1,
2021
IssuedExercisedForfeitedOutstanding
at December
31, 2021
Number of
shares
issuable
BSPCE 2012-2 December 18, 20126.63100,000 — — — 100,000 100,000
BSPCE 08-2013 August 28, 20135.9250,000 — — — 50,000 50,000
BSPCE 09-2014September 16, 201418.6886,150 — — — 86,150 86,150
BSPCE 2015-1February 10, 201518.5768,450 — — — 68,450 68,450
BSPCE 2015-3June 10, 201520.2830,700 — — (350)30,350 30,350
BSPCE 2016 February 2, 201614.46202,617 — — (1,776)200,841 200,841
BSPCE 2017 January 7, 201715.93180,850 — — (1,350)179,500 179,500
Total 718,767   (3,476)715,291 715,291

TypeGrant
date
Exercise
price
(in euros)
Outstanding
at January 1,
2020
IssuedExercisedForfeitedOutstanding
at December
31, 2020
Number of
shares
issuable
BSPCE 2012-2December 18, 20126.63100,000 — — — 100,000 100,000
BSPCE 08-2013August 28, 20135.9250,000 — — — 50,000 50,000
BSPCE 09-2014September 16, 201418.6892,100 — — (5,950)86,150 86,150
BSPCE 2015-1February 10, 201518.5770,950 — — (2,500)68,450 68,450
BSPCE 2015-3June 10, 201520.2838,400 — — (7,700)30,700 30,700
BSPCE 2016February 2, 201614.46212,969 — — (10,352)202,617 202,617
BSPCE 2017January 7, 201715.93187,166 — — (6,316)180,850 180,850
Total 751,585   (32,818)718,767 718,767
BSA)
TypeGrant dateExercise
price
(in euros)
Outstanding at
January 1, 2021
IssuedExercisedForfeitedOutstanding
at December
31, 2021
Number of
shares issuable
BSA 04-12May 4, 20126.0030,000 — — — 30,000 30,000 
BSA 2013April 10, 20136.376,000 — — — 6,000 6,000 
BSA 2014September 16, 201417.6710,000 — — — 10,000 10,000 
BSA 2015-1February 10, 201517.6721,000 — — — 21,000 21,000 
BSA 2015-2(a)June 25, 201519.5464,000 — — — 64,000 64,000 
BSA 2015-2(b)June 25, 201519.54— — — — — — 
BSA 2016February 2, 201613.7436,208 — — (36,208)— — 
BSA 2016-2November 3, 201615.018,000 — — (8,000)— — 
BSA 2017January 7, 201715.7618,000 — — — 18,000 18,000 
BSA 2018-1March 6, 201813.5528,000 — — — 28,000 28,000 
BSA 2018-2July 27, 201816.1025,820 — — — 5,820 5,820 
BSA 2019-1March 29, 201911.6618,000 — — — 18,000 18,000 
BSA 2020March 17, 20206.5918,000 — — — 18,000 18,000 
BSA 2021 (a)April 21, 202113.47— 48,103 — (33,672)14,431 14,431 
BSA 2021 (b)April 21, 202113.64— 30,000 — — 30,000 30,000 
Total 263,028 78,103  (77,880)263,251 263,251 
TypeGrant dateExercise
price
(in euros)
Outstanding at
January 1, 2020
IssuedExercisedForfeitedOutstanding
at December
31, 2020
Number of
shares issuable
BSA 04-12May 4, 20126.0030,000 — — — 30,000 30,000 
BSA 2013April 10, 20136.376,000 — — — 6,000 6,000 
BSA 2014September 16, 201417.6710,000 — — — 10,000 10,000 
BSA 2015-1February 10, 201517.6721,000 — — — 21,000 21,000 
BSA 2015-2(a)June 25, 201519.5464,000 — — — 64,000 64,000 
BSA 2015-2(b)June 25, 201519.546,000 — — (6,000)— — 
BSA 2016February 2, 201613.7436,208 — — — 36,208 36,208 
BSA 2016-2November 3, 201615.018,000 — — — 8,000 8,000 
BSA 2017January 7, 201715.7618,000 — — — 18,000 18,000 
BSA 2018-1March 6, 201813.5528,000 — — — 28,000 28,000 
BSA 2018-2July 27, 201816.1025,820 — — — 5,820 5,820 
BSA 2019-1March 29, 201911.66018,000 — — — 18,000 18,000 
BSA 2020March 17, 20206.59— 18,000 — — 18,000 18,000 
Total 251,028 18,000  (6,000)263,028 263,028 
AGA)
TypeGrant dateExercise
price
(in euros)
Outstanding at
January 1,
2021
IssuedDefinitively acquiredForfeitedOutstanding
at December
31, 2021
Number of
shares exercisable
AGA 2018-1March 6, 2018n.a.24,500 — (24,500)— — — 
AGA 2018-2July 27, 2018n.a.— — — — — — 
AGA 2019-1March 29, 2019n.a.372,000 — (369,250)(2,750)— — 
AGA 2020March 11, 2020n.a.50,000 — — — 50,000 50,000 
AGA 2021April 20, 2021n.a.— 362,515 — (2,003)360,512 360,512 
Total 446,500 362,515 (393,750)(4,753)410,512 410,512 
TypeGrant dateExercise
price
(in euros)
Outstanding at January 1,
2020
IssuedDefinitively acquiredForfeitedOutstanding
at December
31, 2020
Number of
shares
exercisable
AGA 2018-1March 6, 2018n.a.355,250 — (316,083)(14,667)24,500 24,500 
AGA 2018-2July 27, 2018n.a.6,000 — (6,000)— — — 
AGA 2019-1March 29, 2019n.a.385,000 — — (13,000)372,000 372,000 
AGA 2020March 11, 2020n.a.— 50,000 — — 50,000 50,000 
Total 746,250 50,000 (322,083)(27,667)446,500 446,500 
Disclosure of detail of change in stock options OSA)
TypeGrant dateExercise
price
(in euros)
Outstanding at
January 1, 2021
IssuedExercisedForfeitedOutstanding
at December
31, 2021
Number of
shares issuable
OSA 2016-1February 2, 201613.05400 — — — 400 400 
OSA 2016-2November 3, 201614.264,000 — — — 4,000 4,000 
OSA 2017January 7, 201714.97500 — — — 500 500 
OSA 2018March 6, 201812.8752,000 — — — 52,000 52,000 
OSA 2019-1March 29, 201911.0828,750 — — (500)28,250 28,250 
OSA LLY 2019October 24, 20196.41500,000 — — — 500,000 500,000 
OSA 2020March 11, 20206.25400,709 — — (13,253)387,456 387,456 
OSA 2021-04April 20, 202113.74— 571,200 — (80,000)491,200 491,200 
OSA 2021-06June 21, 202112.99— 120,000 — — 120,000 120,000 
Total 986,359 691,200  (93,753)1,583,806 1,583,806 

TypeGrant dateExercise
price
(in euros)
Outstanding at
January 1,
 2020
IssuedExercisedForfeitedOutstanding
at December
31, 2020
Number of
shares
issuable
OSA 2016-1February 2, 201613.05400 — — — 400 400 
OSA 2016-2November 3, 201614.264,000 — — — 4,000 4,000 
OSA 2017January 7, 201714.97500 — — — 500 500 
OSA 2018March 6, 201812.8754,000 — — (2,000)52,000 52,000 
OSA 2019-1March 29, 201911.0830,250 — — (1,500)28,750 28,750 
OSA LLY 2019October 24, 20196.41500,000 — — — 500,000 500,000 
OSA 2020March 11, 20206.25— 407,972 — (7,263)400,709 400,709 
Total 589,150 407,972  (10,763)986,359 986,359