Net loss per share - Computation of diluted net loss per share attributable to common stockholders (Details) - shares	3 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Diluted net loss per share attributable to common stockholders
Antidilutive securities excluded from computation of diluted weighted average shares outstanding (in shares)	17,318,463	18,003,252
Options to purchase common stock
Diluted net loss per share attributable to common stockholders
Antidilutive securities excluded from computation of diluted weighted average shares outstanding (in shares)	12,492,872	12,273,997
Unvested restricted and performance stock units
Diluted net loss per share attributable to common stockholders
Antidilutive securities excluded from computation of diluted weighted average shares outstanding (in shares)	4,825,591	5,231,911
Warrants to purchase common stock
Diluted net loss per share attributable to common stockholders
Antidilutive securities excluded from computation of diluted weighted average shares outstanding (in shares)	0	497,344