Stock-Based Compensation - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2020	Jan. 31, 2020
Number of Shares
Balance at beginning of period (in shares)	13,530,363
Exercised (in shares)	(154,169)
Canceled (in shares)	(251,319)
Balance at end of period (in shares)	13,124,875	13,530,363
Weighted-Average Exercise Price
Balance at beginning of period (in dollars per share)	$ 5.96
Exercised (in dollars per share)	3.15
Canceled (in dollars per share)	12.97
Balance at end of period (in dollars per share)	$ 5.86	$ 5.96
Additional Information
Weighted-Average Remaining Contractual Term (Years)	1 year 8 months 12 days	2 years 1 month 6 days
Aggregate Intrinsic Value	$ 48,971	$ 70,057