Goodwill and intangible assets (Details) - Schedule of intangible assets (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jul. 31, 2014
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]
Finite-lived intangible assets, Gross	$ 28,036	$ 28,478
Finite-lived intangible assets, Accumulated Amortization	(20,914)	(20,370)
Finite-lived intangible assets, Net	7,122us-gaap_FiniteLivedIntangibleAssetsNet	8,108us-gaap_FiniteLivedIntangibleAssetsNet
Patents [Member]
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]
Finite-lived intangible assets, Gross	11,027	11,027
Finite-lived intangible assets, Accumulated Amortization	(10,793)	(10,775)
Finite-lived intangible assets, Net	234	252
Customer Relationships [Member]
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]
Finite-lived intangible assets, Gross	12,343	12,602
Finite-lived intangible assets, Accumulated Amortization	(6,943)	(6,565)
Finite-lived intangible assets, Net	5,400	6,037
Website And Acquired Content [Member]
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]
Finite-lived intangible assets, Gross	1,027	1,037
Finite-lived intangible assets, Accumulated Amortization	(1,027)	(1,037)
Licensed Technology And Other [Member]
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]
Finite-lived intangible assets, Gross	511	537
Finite-lived intangible assets, Accumulated Amortization	(422)	(434)
Finite-lived intangible assets, Net	90	103
Trademarks [Member]
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]
Finite-lived intangible assets, Gross	3,128	3,275
Finite-lived intangible assets, Accumulated Amortization	(1,729)	(1,559)
Finite-lived intangible assets, Net	$ 1,398	$ 1,716

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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