Going Concern (Detail) - USD ($) shares in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents, at Carrying Value		$ 4,842,000		$ 4,842,000			$ 6,532,000
Net Income (Loss) Attributable to Parent		(2,731,000)	$ 421,000	(7,910,000)	$ (5,391,000)
Operating Expenses		2,600,000	3,581,000	8,622,000	6,258,000
Proceeds received under the Paycheck Protection Program				544,000	0
Gain (Loss) on Derivative Instruments, Net, Pretax		(675,000)	3,981,000	156,000	822,000
Interest Income (Expense), Nonoperating, Net		0	21,000	12,000	45,000
Net Cash Provided by (Used in) Operating Activities				(9,143,000)	(5,894,000)
Retained Earnings (Accumulated Deficit)		(192,543,000)		(192,543,000)			(184,633,000)
Stockholders' deficit		6,343,000	$ 11,111,000	6,343,000	11,111,000	$ 1,993,000	$ 6,443,000	$ (468,000)	$ 5,236,000
Gross proceeds				0	$ 12,000,000
Cash requirements for fixed, on-going expenses such as payroll, legal and accounting, patents and overhead at an average cash burn rate		$ 800,000		800,000
ATM equity offering program
Gross proceeds				$ 7,900,000
Subsequent Event | Sale Agreement (ATM)
Stock Issued During Period, Shares, New Issues	2.3
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	$ 61,000,000,000
Gross proceeds	$ 1,500,000