Balance Sheets - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 2,415,000	$ 6,532,000
Prepaid expenses and other	1,020,000	1,718,000
Total current assets	3,435,000	8,250,000
Fixed assets, net	4,453,000	4,748,000
Right-of-use asset	959,000	1,003,000
Total assets	8,847,000	14,001,000
Current liabilities
Accounts payable and accrued expenses	4,214,000	4,025,000
Lease liability-current portion	265,000	259,000
Total current liabilities	4,479,000	4,284,000
Lease liability-long-term	1,142,000	1,210,000
Warrant derivative liability	1,233,000	2,064,000
Total liabilities	6,854,000	7,558,000
Commitments and contingencies (Note 7)
Stockholders’ equity
Preferred Stock, par value $0.0001; 10,000,000 shares authorized; none issued
Common Stock, par value $0.0001; 300,000,000 shares authorized as of 2020 and 2019; shares issued and outstanding - 160,022,000 as of March 31, 2020 and 158,645,000 as of December 31, 2019	16,000	16,000
Additional paid-in capital	191,789,000	191,060,000
Accumulated deficit	(189,812,000)	(184,633,000)
Total stockholders’ equity	1,993,000	6,443,000
Total liabilities and stockholders’ equity	$ 8,847,000	$ 14,001,000