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, 2020
Jul. 31, 2019
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross $ 27,332 $ 27,238
Finite-lived intangible assets, Accumulated Amortization (26,580) (26,206)
Finite-lived intangible assets, Net 752 1,032
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 (11,005) (10,996)
Finite-lived intangible assets, Net 22 31
Customer Relationships [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 11,840 11,746
Finite-lived intangible assets, Accumulated Amortization (11,110) (10,745)
Finite-lived intangible assets, Net 730 1,001
Website And Acquired Content [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 1,008 1,008
Finite-lived intangible assets, Accumulated Amortization (1,008) (1,008)
Licensed Technology And Other [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 483 483
Finite-lived intangible assets, Accumulated Amortization (483) (483)
Trademarks [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 2,974 2,974
Finite-lived intangible assets, Accumulated Amortization $ (2,974) $ (2,974)