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Stockholders' Equity - Summarizes of Stock Option Activities (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2019 USD ($) $ / shares shares
Number of Shares
Shares, Beginning balance | shares	1,691
Shares, Granted | shares	89
Shares, Exercised | shares	(23)
Shares, Canceled | shares	(42)
Shares, Ending balance | shares	1,715
Shares, Vested and exercisable | shares	1,490
Weighted Average Exercise Price Per Share
Weighted Average Exercise Price Per Share, Beginning balance | $ / shares	$ 6.39
Weighted Average Exercise Price Per Share, Granted | $ / shares	15.49
Weighted Average Exercise Price Per Share, Exercised | $ / shares	1.87
Weighted Average Exercise Price Per Share, Canceled | $ / shares	12.71
Weighted Average Exercise Price Per Share, Ending balance | $ / shares	6.77
Weighted Average Exercise Price Per Share, Vested and exercisable | $ / shares	$ 5.84
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Beginning balance | $	$ 14,755
Aggregate Intrinsic Value, Ending balance | $	11,847
Aggregate Intrinsic Value, Vested and exercisable | $	$ 11,514

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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