Condensed Consolidated Balance Sheets - USD ($)	Oct. 31, 2017	Jul. 31, 2017
Current assets
Cash and cash equivalents	$ 3,229,000	$ 1,640,000
Accounts receivable	143,000	297,000
Inventories, net	274,000	273,000
Restricted cash	75,000	75,000
Prepaid expenses	175,000	174,000
Total current assets	3,896,000	2,459,000
Property, plant and equipment, net	530,000	548,000
Patents, net	781,000	822,000
Total assets	5,207,000	3,829,000
Current liabilities
Accounts payable	425,000	426,000
Accrued liabilities	212,000	249,000
Derivative liabilities		1,853,000
Total current liabilities	637,000	2,528,000
Deferred rent	10,000	11,000
Total liabilities	647,000	2,539,000
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.01 par value: 5,000,000 shares authorized, no shares issued and outstanding
Common stock, $0.01 par value: 100,000,000 shares authorized, 67,981,861 shares issued and outstanding at October 31, 2017, and 63,093,153 shares issued and outstanding at July 31, 2017	680,000	631,000
Additional paid-in capital	115,701,000	110,141,000
Accumulated deficit	(111,821,000)	(109,482,000)
Total stockholders' equity	4,560,000	1,290,000
Total liabilities and stockholders' equity	$ 5,207,000	$ 3,829,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.