Stockholders' Equity - Summary of Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
Oct. 31, 2016	Jan. 31, 2016
Number of Shares
Number of Shares, RSUs Beginning Balance	1,056,905
Number of Shares, RSUs granted	1,521,250
Number of Shares, RSUs vested	(549,747)
Number of Shares, RSUs canceled	(127,175)
Number of Shares, RSUs Ending Balance	1,901,233	1,056,905
Weighted-Average Grant-Date Fair Value Per Share
Weighted-Average Grant-Date Fair Value Per Share, Beginning Balance	$ 9.60
Weighted-Average Grant-Date Fair Value Per Share, RSUs granted	7.16
Weighted-Average Grant-Date Fair Value Per Share, RSUs vested	9.09
Weighted-Average Grant-Date Fair Value Per Share, RSUs canceled	8.07
Weighted-Average Grant-Date Fair Value Per Share, Ending Balance	$ 7.56	$ 9.60
Weighted-Average Remaining Contractual Life
Weighted-Average Remaining Contractual Life	1 year 6 months 15 days	1 year 5 months 5 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 16,446	$ 7,176

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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