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Share-based payments - Schedule of Changes in Founder's Warrant (Details) | Jun. 30, 2025 shares | Jan. 07, 2017 shares benefeciary | Feb. 02, 2016 shares benefeciary | Jun. 10, 2015 shares benefeciary | Feb. 10, 2015 shares benefeciary
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Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of awards outstanding (in shares) | 5,158,881 |  |  |  |
BSPCE 2015-1 |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of awards authorised (in shares) |  |  |  |  | 450,000
Total number of awards granted (in shares) |  |  |  |  | 71,650
Total number of shares to which the awards were likely to give right (in shares) |  |  |  |  | 71,650
Number of shares subscribed (in shares) | 0 |  |  |  |
Total number of awards lapsed, cancelled or forfeited (in shares) | 71,650 |  |  |  |
Total number of awards outstanding (in shares) | 0 |  |  |  |
Total number of shares available for subscription (in shares) | 0 |  |  |  |
Maximum total number of shares that may be subscribed (in shares) | 0 |  |  |  |
BSPCE 2015-1 | Corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  |  |  |  | 24,000
BSPCE 2015-1 | Laurent LEVY |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  |  |  |  | 24,000
BSPCE 2015-1 | Beneficiaries other than corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Number of beneficiaries who are not corporate officers | benefeciary |  |  |  |  | 13
BSPCE 2015-3 |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of awards authorised (in shares) |  |  |  | 450,000 |
Total number of awards granted (in shares) |  |  |  | 53,050 |
Total number of shares to which the awards were likely to give right (in shares) |  |  |  | 53,050 |
Number of shares subscribed (in shares) | 0 |  |  |  |
Total number of awards lapsed, cancelled or forfeited (in shares) | 53,050 |  |  |  |
Total number of awards outstanding (in shares) | 0 |  |  |  |
Total number of shares available for subscription (in shares) | 0 |  |  |  |
Maximum total number of shares that may be subscribed (in shares) | 0 |  |  |  |
BSPCE 2015-3 | Beneficiaries other than corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Number of beneficiaries who are not corporate officers | benefeciary |  |  |  | 42 |
BSPCE 2016 O |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of awards authorised (in shares) |  |  | 450,000 |  |
Total number of awards granted (in shares) |  |  | 126,400 |  |
Total number of shares to which the awards were likely to give right (in shares) |  |  | 126,400 |  |
Number of shares subscribed (in shares) | 333 |  |  |  |
Total number of awards lapsed, cancelled or forfeited (in shares) | 29,250 |  |  |  |
Total number of awards outstanding (in shares) | 96,817 |  |  |  |
Total number of shares available for subscription (in shares) | 96,817 |  |  |  |
Maximum total number of shares that may be subscribed (in shares) | 96,817 |  |  |  |
BSPCE 2016 O | Corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  |  | 23,500 |  |
BSPCE 2016 O | Laurent LEVY |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  |  | 23,500 |  |
BSPCE 2016 O | Beneficiaries other than corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Number of beneficiaries who are not corporate officers | benefeciary |  |  | 43 |  |
BSPCE 2016 P |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of awards authorised (in shares) |  |  | 450,000 |  |
Total number of awards granted (in shares) |  |  | 129,250 |  |
Total number of shares to which the awards were likely to give right (in shares) |  |  | 129,250 |  |
Number of shares subscribed (in shares) | 0 |  |  |  |
Total number of awards lapsed, cancelled or forfeited (in shares) | 31,150 |  |  |  |
Total number of awards outstanding (in shares) | 98,100 |  |  |  |
Total number of shares available for subscription (in shares) | 98,100 |  |  |  |
Maximum total number of shares that may be subscribed (in shares) | 98,100 |  |  |  |
BSPCE 2016 P | Corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  |  | 23,500 |  |
BSPCE 2016 P | Laurent LEVY |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  |  | 23,500 |  |
BSPCE 2016 P | Beneficiaries other than corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Number of beneficiaries who are not corporate officers | benefeciary |  |  | 50 |  |
BSPCE 2017 O |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of awards authorised (in shares) |  | 450,000 |  |  |
Total number of awards granted (in shares) |  | 117,650 |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  | 117,650 |  |  |
Number of shares subscribed (in shares) | 0 |  |  |  |
Total number of awards lapsed, cancelled or forfeited (in shares) | 20,600 |  |  |  |
Total number of awards outstanding (in shares) | 97,050 |  |  |  |
Total number of shares available for subscription (in shares) | 97,050 |  |  |  |
Maximum total number of shares that may be subscribed (in shares) | 97,050 |  |  |  |
BSPCE 2017 O | Corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  | 26,400 |  |  |
BSPCE 2017 O | Laurent LEVY |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  | 26,400 |  |  |
BSPCE 2017 O | Beneficiaries other than corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Number of beneficiaries who are not corporate officers | benefeciary |  | 42 |  |  |
BSCPE 2017 |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of awards authorised (in shares) |  | 450,000 |  |  |
Total number of awards granted (in shares) |  | 80,000 |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  | 80,000 |  |  |
Number of shares subscribed (in shares) | 0 |  |  |  |
Total number of awards lapsed, cancelled or forfeited (in shares) | 0 |  |  |  |
Total number of awards outstanding (in shares) | 80,000 |  |  |  |
Total number of shares available for subscription (in shares) | 80,000 |  |  |  |
Maximum total number of shares that may be subscribed (in shares) | 80,000 |  |  |  |
BSCPE 2017 | Corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  | 32,000 |  |  |
BSCPE 2017 | Laurent LEVY |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Total number of shares to which the awards were likely to give right (in shares) |  | 32,000 |  |  |
BSCPE 2017 | Beneficiaries other than corporate officers |  |  |  |  |
Disclosure Of Detailed Information About Share-based Payments [Line Items] |  |  |  |  |
Number of beneficiaries who are not corporate officers | benefeciary |  | 3 |  |  |

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