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, 2018
Jul. 31, 2018
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross $ 27,210 $ 27,347
Finite-lived intangible assets, Accumulated Amortization (25,585) (25,461)
Finite-lived intangible assets, Net 1,625 1,886
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 (10,983) (10,980)
Finite-lived intangible assets, Net 44 47
Customer Relationships [Member]    
Goodwill and intangible assets (Details) - Schedule of intangible assets [Line Items]    
Finite-lived intangible assets, Gross 11,699 11,836
Finite-lived intangible assets, Accumulated Amortization (10,118) (9,997)
Finite-lived intangible assets, Net $ 1,581 $ 1,839