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Stockholder's Equity (Details Textuals 2) (USD $)	12 Months Ended			1 Months Ended
	Jul. 31, 2013 Employee Stock Purchase Plan (ESPP)	Jul. 31, 2012 Employee Stock Purchase Plan (ESPP)	Jul. 31, 2011 Employee Stock Purchase Plan (ESPP)	Dec. 31, 2007 2007 Equity Incentive Plan	Jul. 31, 2013 2001 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized to purchase	5,000,000			8,000,000
Share-based compensation arrangement by share-based payment award, discount from market price, purchase date	15.00%
Share-based compensation arrangement by share-based payment award, maximum employee contribution permitted value	$ 25,000
The number of shares of common stock issued pursuant to the ESPP	84,761	97,769	127,192
Common stock have been issued pursuant to the ESPP	3,759,112
Shares were available for future grant under the Plan (in shares)	1,240,888				1,684,091
Share-based compensation arrangement by share-based payment award, award requisite service period				5 years
Maximum vesting term for incentive and non-qualified stock options determined by board of directors				10 years
Maximum percentage of salary withheld for employee contribution	up to 10 percent
Compensation contribution limit in percentage	may not exceed 15

X

- Definition

Represents limit of percentage of compensation contribution with respect to increase in amount.

+ References

No definition available.

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- Definition

The number of shares to be repurchased by an entity's Board of Directors under a Employee Stock Purchase Plan.

+ References

No definition available.

+ Details

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X

- Definition

An entity may opt to disclose the highest amount maximum employee contribution permitted to utilize with respect to the plan.

+ References

No definition available.

+ Details

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- Definition

Represents percentage of salary employee to make contributions to purchase shares of common stock under employee stock purchase plan.

+ References

No definition available.

+ Details

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- Definition

Represents the maximum vesting term for incentive and non-qualified stock options determined by board of directors.

+ References

No definition available.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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)(1)

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

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

+ 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

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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

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)(3)

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

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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

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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