Quarterly report pursuant to Section 13 or 15(d)

Goodwill and intangible assets (Details) - Schedule of intangible assets

v3.5.0.2
Goodwill and intangible assets (Details) - Schedule of intangible assets - USD ($)
$ in Thousands
Oct. 31, 2016
Jul. 31, 2016
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross $ 27,460 $ 27,650
Finite-lived intangible assets, Accumulated Amortization (23,489) (23,228)
Finite-lived intangible assets, Net 3,971 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 (10,914) (10,905)
Finite-lived intangible assets, Net 113 122
Customer Relationships [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 12,011 12,122
Finite-lived intangible assets, Accumulated Amortization (8,501) (8,331)
Finite-lived intangible assets, Net 3,510 3,791
Website And Acquired Content [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 1,004 1,011
Finite-lived intangible assets, Accumulated Amortization (1,004) (1,011)
Licensed Technology And Other [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 470 485
Finite-lived intangible assets, Accumulated Amortization (428) (437)
Finite-lived intangible assets, Net 42 48
Trademarks [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 2,948 3,005
Finite-lived intangible assets, Accumulated Amortization (2,642) (2,544)
Finite-lived intangible assets, Net $ 306 $ 461