Condensed Balance Sheets - USD ($)		Sep. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents		$ 16,947,000	$ 33,892,000
Prepaid expenses and other		1,374,000	1,740,000
Total current assets		18,321,000	35,632,000
Fixed assets, net		367,000	2,564,000
Right-of-use asset, net		150,000	629,000
Total assets		18,838,000	38,825,000
Current liabilities
Accounts payable and accrued expenses		3,592,000	4,811,000
Lease liability-current portion		332,000	311,000
Total current liabilities		3,924,000	5,122,000
Lease liability-long-term		362,000	614,000
Warrant derivative liability		421,000	5,805,000
Asset retirement obligation		282,000	0
Total liabilities		4,989,000	11,541,000
Commitments and contingencies (Note 5)
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; shares issued and outstanding - 15,085,792 as of September 30, 2022 and 15,155,026 as of December 31, 2021	[1]	2,000	2,000
Additional paid-in capital	[1]	245,566,000	244,884,000
Accumulated deficit		(231,719,000)	(217,602,000)
Total stockholders' equity		13,849,000	27,284,000
Total liabilities and stockholders' equity		$ 18,838,000	$ 38,825,000

[1] September 30, 2022 and December 31, 2021 balances have been retroactively adjusted to reflect the 15-to-1 reverse stock split effected November 9, 2022.