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, 2017
Jul. 31, 2016
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross $ 27,447 $ 27,650
Finite-lived intangible assets, Accumulated Amortization (23,887) (23,228)
Finite-lived intangible assets, Net 3,560 4,422
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 (10,922) (10,905)
Finite-lived intangible assets, Net 104 122
Customer Relationships [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 12,007 12,122
Finite-lived intangible assets, Accumulated Amortization (8,739) (8,331)
Finite-lived intangible assets, Net 3,268 3,791
Website And Acquired Content [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 1,005 1,011
Finite-lived intangible assets, Accumulated Amortization (1,005) (1,011)
Licensed Technology And Other [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 475 485
Finite-lived intangible assets, Accumulated Amortization (440) (437)
Finite-lived intangible assets, Net 35 48
Trademarks [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 2,934 3,005
Finite-lived intangible assets, Accumulated Amortization (2,781) (2,544)
Finite-lived intangible assets, Net $ 153 $ 461