Common Stock and Stockholders' Equity - Summary of Stock Option Activity (Details) - 2006 Stock Plan and 2016 Equity Incentive Plan - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Outstanding Stock Options
Beginning balance (in shares)	2,608,640
Options exercised (in shares)	(759,390)
Options forfeited (in shares)	(8,303)
Ending balance (in shares)	1,840,947	2,608,640
Outstanding stock options, exercisable (in shares)	1,784,435
Weighted- Average Exercise Price
Beginning balance (in dollars per share)	$ 20.65
Options exercised (in dollars per share)	12.42
Options forfeited (in dollars per share)	70.45
Ending balance (in dollars per share)	23.82	$ 20.65
Weighted-average exercise price, exercisable (in dollars per share)	$ 22.13
Weighted-Average Remaining Contractual Life (in years)
Weighted-average remaining contractual life (in years), options outstanding	4 years 8 months 12 days	5 years 7 months 6 days
Weighted-average remaining contractual life (in years), exercisable	4 years 8 months 12 days
Aggregate intrinsic value, options outstanding	$ 203,339	$ 754,478
Aggregate intrinsic value, exercisable	$ 200,107
Market And Service Based Stock Options
Outstanding Stock Options
Ending balance (in shares)	711,839