Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2013
U.S federal [Member]
Income Tax (Textual)
Operating Loss Carryforwards	$ 127.0
Operating loss carryforwards expiration term	The U.S. federal net operating loss carryforwards will start to expire in fiscal 2022, with fiscal 2012's loss expiring in fiscal 2033.
State [Member]
Income Tax (Textual)
Operating Loss Carryforwards	125.0
Operating loss carryforwards expiration term	The state net operating loss carryforwards will start to expire in fiscal 2022, with fiscal 2012's loss expiring in fiscal 2033.
State [Member] | Straight Path IP [Member]
Income Tax (Textual)
Operating Loss Carryforwards	$ 2.3