Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Operating activities:
Net loss	$ (15,556)	$ (4,255)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation - restricted common stock	951	2,417
Stock-based compensation - stock options		97
Amortization of debt discounts	649
Changes in assets and liabilities:
Trade accounts receivable, net	26	(7)
Inventory
Assets held for sale - Straight Path IP Group	3
Prepaid expenses and other current assets	(1,308)	(7)
Prepaid expenses - related to sale of Straight Path IP Group	1,029
Other assets	3	(1)
Trade accounts payable	285	383
Accrued expenses	9,077	(520)
Liabilities held for sale - Straight Path IP Group	(357)
FCC consent decree payable	(3,500)
Deferred revenue	(54)	95
Income taxes payable		(2)
Net cash used in operating activities	(8,752)	(1,800)
Investing activities:
Proceeds from sale of Straight Path IP Group	6,000
Net cash provided by investing activities	6,000
Financing activities:
Capital contribution related to IDT settlement agreement and release	10,000
Dividend related to IDT settlement agreement and release	(750)
Payments of loans payable	(8,500)
Costs related to loans payable	(39)
Common stock issued upon exercise of warrants	1,057
Common stock issued upon exercise of stock options	8
Net cash provided by financing activities	1,776
Net decrease in cash and cash equivalents	(976)	(1,800)
Cash and cash equivalents at beginning of period	8,535	11,361
Cash and cash equivalents at end of period	7,559	9,561
Supplemental schedule of noncash activities
Gain on sale of Straight Path IP Group classified as additional paid-in capital	5,195
Elimination of noncontrolling interests due to sale of Straight Path IP Group	2,919
Issuance of warrants with loans payable	50
Dvidend payable	3,750
Supplemental cash flow information
Cash paid during the period for interest	383
Cash paid during the period for income taxes	$ 7	$ 7