Annual report pursuant to Section 13 and 15(d)

Goodwill and intangible assets (Details) - Schedule of intangible assets

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Goodwill and intangible assets (Details) - Schedule of intangible assets (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2014
Jul. 31, 2013
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross $ 28,478 $ 28,214
Finite-lived intangible assets, Accumulated Amortization (20,370) (18,271)
Finite-lived intangible assets, Net 8,108 9,943
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 (10,775) (10,587)
Finite-lived intangible assets, Net 252 440
Customer Relationships [Member]
    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 12,602 12,446
Finite-lived intangible assets, Accumulated Amortization (6,565) (5,448)
Finite-lived intangible assets, Net 6,037 6,998
Website And Acquired Content [Member]
    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 1,037 1,026
Finite-lived intangible assets, Accumulated Amortization (1,037) (980)
Finite-lived intangible assets, Net   46
Licensed Technology And Other [Member]
    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 537 513
Finite-lived intangible assets, Accumulated Amortization (434) (382)
Finite-lived intangible assets, Net 103 131
Trademarks [Member]
    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 3,275 3,202
Finite-lived intangible assets, Accumulated Amortization (1,559) (874)
Finite-lived intangible assets, Net $ 1,716 $ 2,328