Common stock options early exercised prior to vesting.

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- Definition

Stock issued during period shares stock options early exercised.

+ References

No definition available.

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- Definition

Amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Number of shares issued which are neither cancelled nor held in the treasury.

+ References

No definition available.

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Oct. 31, 2016	Oct. 31, 2016	Jan. 31, 2016	Oct. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	52,722	52,722		88,699
Common stock, shares, Issued	12,614	110,603
Common stock options early exercised prior to vesting	0	1,771
Accrued expenses and other long-term liabilities	$ 0.1	$ 0.1	$ 0.2
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to non-vested stock option grants	3.7	$ 3.7
Stock-based compensation expenses recognized on straight line basis offering period		1 year 9 months 18 days
Number of Shares Underlying Outstanding Options, Options granted		0
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to non-vested stock option grants	$ 13.5	$ 13.5
Stock-based compensation expenses recognized on straight line basis offering period		2 years 9 months 18 days
Non employee stock options outstanding	1,901,233	1,901,233	1,056,905
Restricted Stock Units (RSUs) \| Non Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non employee stock options outstanding	68,907	68,907		70,500
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense related to non-vested stock option grants	$ 1.3	$ 1.3
Stock-based compensation expenses recognized on straight line basis offering period		1 year 1 month 6 days