CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Jul. 31, 2020		62,787,919
Beginning balance at Jul. 31, 2020	$ 48,818	$ 628	$ 7,478,047	$ (7,433,700)	$ 3,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,551)			(3,551)
Preferred dividends	(537)			(537)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		6,982
Issuance of common stock pursuant to employee stock purchase plan	3		3
Restricted stock forfeitures, net of issuance (in shares)		(932)
Share-based compensation	188		188
Other comprehensive items	2,973				2,973
Ending balance (in shares) at Oct. 31, 2020		62,793,969
Ending balance at Oct. 31, 2020	$ 47,894	$ 628	7,478,238	(7,437,788)	6,816
Beginning balance (in shares) at Jul. 31, 2021	63,099,496	63,099,496
Beginning balance at Jul. 31, 2021	$ 6,212	$ 632	7,478,638	(7,480,220)	7,162
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(19,494)			(19,494)
Preferred dividends	(537)			(537)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		168
Restricted stock grants (in shares)		87,990
Restricted stock grants	0	$ 1	(1)
Restricted stock forfeitures, net of issuance (in shares)		(2,750,000)
Restricted stock forfeitures	0	$ (28)	28
Share-based compensation	190		190
Other comprehensive items	$ 198				198
Ending balance (in shares) at Oct. 31, 2021	60,437,654	60,437,654
Ending balance at Oct. 31, 2021	$ (13,431)	$ 605	$ 7,478,855	$ (7,500,251)	$ 7,360