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
Jan. 31, 2018
Jul. 31, 2017
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross $ 27,738 $ 27,436
Finite-lived intangible assets, Accumulated Amortization (25,289) (24,541)
Finite-lived intangible assets, Net 2,449 2,895
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 (10,964) (10,951)
Finite-lived intangible assets, Net 63 76
Customer Relationships [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 12,046 11,881
Finite-lived intangible assets, Accumulated Amortization (9,667) (9,083)
Finite-lived intangible assets, Net 2,379 2,798
Website And Acquired Content [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 1,022 1,011
Finite-lived intangible assets, Accumulated Amortization (1,022) (1,011)
Licensed Technology And Other [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 498 484
Finite-lived intangible assets, Accumulated Amortization (491) (463)
Finite-lived intangible assets, Net 7 21
Trademarks [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 3,145 3,033
Finite-lived intangible assets, Accumulated Amortization $ (3,145) $ (3,033)