Net loss per share attributable to common stockholders - Schedule of Shares Excluded from Computation of Diluted Net Loss Per Share (Details) - shares	9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	6,725,641	6,767,931
Stock options to purchase common stock, restricted stock and performance stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	6,642,857	6,701,132
Employee stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	82,784	66,799