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Stockholders' Equity - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Oct. 31, 2019 USD ($) Peroid $ / shares shares	Oct. 31, 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	0.2	0.3
Weighted purchase price of shares of common stock under ESPP	$ 9.97	$ 6.82
Stock Options
Stockholders Equity Note Disclosure [Line Items]
Aggregate intrinsic value of vested options exercised | $	$ 1.9	$ 1.2
Weighted-average grant date fair value of options granted	$ 7.13	$ 5.28

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- Definition

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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Share based compensation arrangement by share based payment awards purchase period.

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Stockholders equity note disclosure.

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- Definition

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 grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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