Equity Incentive Plans and Stock-Based Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 31, 2021 USD ($) $ / shares shares	Jan. 31, 2021 USD ($) $ / shares shares
Stock Options
Outstanding, beginning balance (in shares) | shares	23,013
Granted (in shares) | shares	779
Exercised (in shares) | shares	(7,723)
Forfeited (in shares) | shares	(380)
Expired (in shares) | shares	(7)
Outstanding, ending balance (in shares) | shares	15,682	23,013
Weighted- Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 1.58
Granted (in dollars per share) | $ / shares	0.10
Exercised (in dollars per share) | $ / shares	1.18
Forfeited (in dollars per share) | $ / shares	2.44
Expired (in dollars per share) | $ / shares	2.40
Outstanding, ending balance (in dollars per share) | $ / shares	$ 1.69	$ 1.58
Vested and exercisable, Number of Stock Options (in shares) | shares	7,915
Vested and exercisable, Weighted-average exercise price (in dollars per share) | $ / shares	$ 1.30
Outstanding, Weighted-Average Remaining Contractual Life (years)	7 years 4 months 24 days	7 years 10 months 24 days
Vested and exercisable, Weighted-Average Remaining Contractual Life (years)	6 years 10 months 24 days
Outstanding, Aggregate Intrinsic Value | $	$ 761,567	$ 1,207,831
Vested and exercisable, Aggregate Intrinsic Value | $	$ 387,410