CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Balance at Jul. 31, 2017	$ 62,971	$ 556	$ 7,457,051	$ (7,398,949)	$ 4,313
Balance, shares at Jul. 31, 2017		55,555,973
Net loss	(5,237)			(5,237)
Issuance of common stock pursuant to employee stock purchase plan and stock option exercises	3		3
Issuance of common stock pursuant to employee stock purchase plan and stock option exercises, shares		1,353
Share-based compensation	292		292
Other comprehensive items	285				285
Balance at Oct. 31, 2017	58,314	$ 556	7,457,346	(7,404,186)	4,598
Balance, shares at Oct. 31, 2017		55,557,326
Balance at Jul. 31, 2018	$ 107,628	$ 608	7,467,855	(7,363,569)	2,734
Balance, shares at Jul. 31, 2018	60,742,859	60,742,859
Net loss	$ (7,365)			(7,365)
Effect of adoption of accounting standards	6,138			6,138
Preferred dividends	(536)			(536)
Issuance of common stock pursuant to employee stock purchase plan and stock option exercises	6		6
Issuance of common stock pursuant to employee stock purchase plan and stock option exercises, shares		3,107
Restricted stock grants		$ 6	(6)
Restricted stock grants, shares		640,922
Share-based compensation	792		792
Other comprehensive items	(1,232)				(1,232)
Balance at Oct. 31, 2018	$ 105,431	$ 614	$ 7,468,647	$ (7,365,332)	$ 1,502
Balance, shares at Oct. 31, 2018	61,386,888	61,386,888