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
Oct. 31, 2017
Jul. 31, 2017
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross $ 27,318 $ 27,436
Finite-lived intangible assets, Accumulated Amortization (24,671) (24,541)
Finite-lived intangible assets, Net 2,647 2,895
Patents [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 11,026 11,027
Finite-lived intangible assets, Accumulated Amortization (10,957) (10,951)
Finite-lived intangible assets, Net 69 76
Customer Relationships [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 11,823 11,881
Finite-lived intangible assets, Accumulated Amortization (9,260) (9,083)
Finite-lived intangible assets, Net 2,563 2,798
Website And Acquired Content [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 1,007 1,011
Finite-lived intangible assets, Accumulated Amortization (1,007) (1,011)
Licensed Technology And Other [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 485 484
Finite-lived intangible assets, Accumulated Amortization (470) (463)
Finite-lived intangible assets, Net 15 21
Trademarks [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 2,977 3,033
Finite-lived intangible assets, Accumulated Amortization $ (2,977) $ (3,033)