Employee benefit plan (Details) - Schedule of contrubutions plan - USD ($) $ in Thousands	12 Months Ended
Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Schedule of contrubutions plan [Abstract]
Contributions	$ 224	$ 279	$ 467

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration