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
Apr. 30, 2017
Jul. 31, 2016
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross $ 27,491 $ 27,650
Finite-lived intangible assets, Accumulated Amortization (24,247) (23,228)
Finite-lived intangible assets, Net 3,244 4,422
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 (10,931) (10,905)
Finite-lived intangible assets, Net 96 122
Customer Relationships [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 12,034 12,122
Finite-lived intangible assets, Accumulated Amortization (8,948) (8,331)
Finite-lived intangible assets, Net 3,086 3,791
Website And Acquired Content [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 1,006 1,011
Finite-lived intangible assets, Accumulated Amortization (1,006) (1,011)
Licensed Technology And Other [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 481 485
Finite-lived intangible assets, Accumulated Amortization (450) (437)
Finite-lived intangible assets, Net 31 48
Trademarks [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 2,943 3,005
Finite-lived intangible assets, Accumulated Amortization (2,912) (2,544)
Finite-lived intangible assets, Net $ 31 $ 461