Amortization expense included in stock based compensation.

No definition available.

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- Definition

Employee stock purchase plan offering period.

+ References

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share based payment award number of additional shares authorized annual increase percentage.

+ References

No definition available.

+ Details

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

+ Details

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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.

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

+ Details

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- Definition

General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

+ Details

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Balance Type:	na
Period Type:	duration

- 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.

+ Details

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- Definition

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

+ References

+ Details

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

+ Details

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

+ Details

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Period Type:	instant

- Definition

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.

+ References

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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

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Period Type:	duration

- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ References

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Stock Incentive Plan - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2015	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unamortized expense		$ 0.1
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period of recognition		3 years 3 months 18 days
Remaining unamortized expense		$ 7.9
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of options granted		$ 4.19	$ 6.21	$ 2.63
Total intrinsic value of stock options exercised		$ 4.7	$ 6.1	$ 3.6
Total fair value of options vested		3.2	1.7	$ 0.7
Total unrecognized stock-based compensation cost		$ 7.4
Weighted-average period of recognition		2 years 10 months 24 days
Series G-1 convertible preferred stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization included in stock-based compensation expense		$ 0.2	$ 0.6
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for future issuance		0
2015 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for future issuance	2,700,000	4,349,738
Number of shares reserved and authorized for issuance	4,515,212
Additional annual increase shares reserved for issuance description		Additionally, the 2015 Plan provides that the number of shares reserved and available for issuance will increase annually on the first day of each fiscal year beginning with the 2016 fiscal year equal to the least of (i) 3,100,000 shares of Common Stock, (ii) 4% of the outstanding shares of Common Stock on the last day of immediately preceding fiscal year, or (iii) an amount determined by the board of directors.
Additional annual increase number of shares reserved and authorized for issuance	3,100,000
Additional annual increase percentage of shares reserved and authorized for issuance	4.00%
Common shares available for issuance		430,729
2015 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved and authorized for issuance		775,000
Additional annual increase shares reserved for issuance description		Additionally, the ESPP provides that the number of shares reserved and available for issuance will increase annually on the first day of each fiscal year beginning with the 2016 fiscal year equal to the least of (i) 775,000 shares of Common Stock, (ii) 1% of the outstanding shares of Common Stock on the last day of immediately preceding fiscal year, or (iii) an amount determined by the ESPP administrator.
Additional annual increase number of shares reserved and authorized for issuance		775,000
Additional annual increase percentage of shares reserved and authorized for issuance		1.00%
Common shares available for issuance		772,454
Common stock purchase, maximum deduction as a percentage of eligible compensation		15.00%
Common stock purchase, percentage of purchase price		85.00%
ESPP offering periods		6 months
Number of shares purchased by and distributed to employees (in shares)		296,411
Average price per share of shares purchased by and distributed to employees (usd per share)		$ 6.94
Weighted-average period of recognition		4 months 24 days
Remaining unamortized expense		$ 0.4