Condensed Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net loss	$ (16,163,000)	$ (25,157,000)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	14,000	13,000
Change in fair value of warrant liabilities	(321,000)	208,000
Stock compensation expense	576,000	369,000
Changes in assets and liabilities:
Receivables	9,000	61,000
Prepaid expenses and other assets	530,000	(72,000)
Accounts payable	(2,076,000)	562,000
Accrued expenses and other current liabilities	(1,830,000)	1,167,000
Deferred revenue	(226,000)	(226,000)
Net cash used in operating activities	(19,487,000)	(23,075,000)
Investing activities:
Payments for purchase of property and equipment		(15,000)
Net cash used in investing activities		(15,000)
Financing activities:
Proceeds from the sale of common stock and warrants, net of costs	55,041,000	9,062,000
Proceeds from the exercise of common warrants	495,000	10,294,000
Proceeds from the exercise of pre-funded warrants		1,000
Proceeds from the exercise of stock options	24,000
Net cash provided by financing activities	55,560,000	19,357,000
Effect of foreign currency translation on cash	(28,000)	32,000
Net increase (decrease) in cash and cash equivalents	36,045,000	(3,701,000)
Cash and cash equivalents at beginning of period	19,025,000	22,726,000
Cash and cash equivalents at end of period	$ 55,070,000	$ 19,025,000