Basic and Diluted Net Loss per Share - Antidilutive Securities (Details) - shares	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common share equivalents (in shares)	108,661,633	79,395,156	62,809,839
2028 Convertible Notes (on an as-converted basis)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common share equivalents (in shares)	24,999,990	12,483,569	0
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common share equivalents (in shares)	11,396,756	17,600,524	22,200,869
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common share equivalents (in shares)	28,416,127	12,935,413	4,033,418
Unvested early exercised common stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common share equivalents (in shares)	665	40,555	132,180
Common stock warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common share equivalents (in shares)	34,499,436	34,499,436	35,549,024
Employee stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common share equivalents (in shares)	9,348,659	1,835,659	894,348