Going Concern (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Going Concern
Cash and Cash Equivalents, at Carrying Value	$ 2,415,000		$ 6,532,000
Net Income (Loss) Attributable to Parent	(5,179,000)	$ (5,812,000)
Operating Expenses	6,021,000	2,676,000
Gain (Loss) on Derivative Instruments, Net, Pretax	831,000	(3,160,000)
Interest Income (Expense), Nonoperating, Net	11,000	24,000
Net Cash Provided by (Used in) Operating Activities	(4,553,000)	(2,440,000)
Retained Earnings (Accumulated Deficit)	(189,812,000)		(184,633,000)
Stockholders' deficit	1,993,000	$ (468,000)	$ 6,443,000	$ 5,236,000
Gross proceeds	700,000
Cash requirements for fixed, on-going expenses such as payroll, legal and accounting, patents and overhead at an average cash burn rate	$ 800,000