Stock-based compensation - Narrative (Details) $ / shares in Units, $ in Millions				1 Months Ended	7 Months Ended	12 Months Ended
	Mar. 07, 2024 $ / shares	Jan. 01, 2021 shares	Dec. 28, 2015 shares	Sep. 30, 2020 period shares	Oct. 31, 2024 employee	Dec. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) shares	Jan. 01, 2026 shares	Jun. 30, 2025 shares	Feb. 28, 2022 shares	Jan. 31, 2022 shares	Jan. 01, 2022 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized (in shares)						300,000,000	150,000,000		300,000,000
Common stock, shares outstanding						96,914,418	70,625,899
Restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation, shares authorized for issuance										563,500	563,500
Share-based compensation, number of common stock issuable per RSU vested						1
Time-Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs | $						$ 9.1
Expected to be recognized over a weighted average period						2 years 8 months 12 days
2015 Incentive Stock Option and Grant Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares reserved for issuance			2,525,327
Cliff vesting period			1 year
Contractual life of options from the date of grant			10 years
Common stock shares available for issuance (in shares)						3,845,524
2015 Incentive Stock Option and Grant Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting period			5 years
2015 Incentive Stock Option and Grant Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting period			8 years
2020 Stock Option and Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares reserved for issuance				6,567,144
Common stock shares available for issuance (in shares)						3,845,524
Options granted (in dollars per share) | $ / shares	$ 22.00					$ 2.92
Tranche two exercise price (in dollars per share) | $ / shares	11.88
Tranche one exercise price (in dollars per share) | $ / shares	$ 19.00
Incremental cost of plan modification | $						$ 0.4	$ 1.2
Unrecognized compensation costs | $						$ 14.0
Expected to be recognized over a weighted average period						2 years 2 months 12 days
Percentage of outstanding shares of common stock		5.00%
2020 Stock Option and Incentive Plan | Subsequent event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized (in shares)								4,845,720
2020 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares reserved for issuance						2,652,916
Common stock, shares authorized (in shares)												656,714
Maximum authorized payroll deduction percentage of eligible compensation for eligible employees				15.00%
Number of annual offering periods (or more) | period				1
Shares issued under employee stock purchase plan (in shares)						170,703
Percentage of outstanding shares of common stock		1.00%
Common stock, shares outstanding		656,714
Inducement Grants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting period					4 years
Options granted (in dollars per share) | $ / shares						$ 0
Unrecognized compensation costs | $						$ 2.0
Expected to be recognized over a weighted average period						2 years 4 months 24 days
Number of employees granted non-qualified stock options | employee					3
Inducement Grants | Share-Based Payment Arrangement, Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights, percentage					25.00%
Inducement Grants | Share-Based Payment Arrangement, Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights, percentage					25.00%
Inducement Grants | Share-Based Payment Arrangement, Tranche Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights, percentage					25.00%
Inducement Grants | Share Based Compensation Award, Tranche Four
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights, percentage					25.00%