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Stockholders' Equity - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Apr. 30, 2019 USD ($) Peroid $ / shares shares	Apr. 30, 2018 USD ($) $ / shares shares
ESPP
Stockholders Equity Note Disclosure [Line Items]
Percentage of eligible compensation subject to plan limitation	15.00%
Employee stock purchase plan offering period	24 months
Number of purchase periods | Peroid	4
Purchase periods	6 months
Purchase price of common stock as percentage of fair market value	85.00%
Number of shares of common stock issued under ESPP | shares	0.1	0.2
Weighted purchase price of shares of common stock under ESPP	$ 9.86	$ 5.65
Stock Options
Stockholders Equity Note Disclosure [Line Items]
Employee stock option expiration period	10 years
Aggregate intrinsic value of vested options exercised | $	$ 0.3	$ 0.2
Weighted-average grant date fair value of options granted	$ 7.13	$ 5.28
Stock Options | Maximum
Stockholders Equity Note Disclosure [Line Items]
Employee stock option vesting period	4 years
Restricted Stock Units (RSUs) | Maximum
Stockholders Equity Note Disclosure [Line Items]
Employee stock option vesting period	4 years
Restricted Stock Units (RSUs) | Minimum
Stockholders Equity Note Disclosure [Line Items]
Employee stock option vesting period	1 year

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Employee stock purchase plan offering period in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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