Quarterly report pursuant to Section 13 or 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
Jan. 31, 2014
Jul. 31, 2013
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross $ 28,471 $ 28,214
Finite-lived intangible assets, Accumulated Amortization (19,360) (18,271)
Finite-lived intangible assets, Net 9,111 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 (10,632) (10,587)
Finite-lived intangible assets, Net 395 440
Customer Relationships [Member]
    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 12,594 12,446
Finite-lived intangible assets, Accumulated Amortization (6,038) (5,448)
Finite-lived intangible assets, Net 6,556 6,998
Website And Acquired Content [Member]
    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 1,036 1,026
Finite-lived intangible assets, Accumulated Amortization (1,023) (980)
Finite-lived intangible assets, Net 13 46
Licensed Technology And Other [Member]
    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 531 513
Finite-lived intangible assets, Accumulated Amortization (414) (382)
Finite-lived intangible assets, Net 117 131
Trademarks [Member]
    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 3,283 3,202
Finite-lived intangible assets, Accumulated Amortization (1,253) (874)
Finite-lived intangible assets, Net $ 2,030 $ 2,328