Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities:
Net loss	$ (8,774,000)	$ (5,495,000)
Adjustments required to reconcile net loss to net cash used in operating activities:
Depreciation	226,000	281,000
Stock-based compensation	493,000	842,000
Non-cash interest expense		62,000
Payment of accreted interest for deferred consideration for asset acquisition		(586,000)
Changes in operating assets and liabilities:
Award receivable	1,753,000	(564,000)
Accounts payable and accrued liabilities	940,000	(409,000)
Accrued compensation	234,000	330,000
Operating lease right-of-use asset and liability, net	890,000	49,000
Prepaid expenses and other current assets	723,000	15,000
Net cash used in operating activities	(3,515,000)	(5,475,000)
Investing activities:
Purchases of property and equipment	(236,000)	(298,000)
Net cash used in investing activities	(236,000)	(298,000)
Financing activities:
Principal payment of deferred consideration for asset acquisition		(1,414,000)
Proceeds from sale of common stock, net of offering costs	44,631,000	19,548,000
Proceeds from exercise of warrants and stock options		445,000
Net cash provided by financing activities	44,631,000	18,579,000
Net increase in cash, cash equivalents and restricted cash	40,880,000	12,806,000
Cash, cash equivalents and restricted cash, beginning of period	11,488,000	10,849,000
Cash, cash equivalents and restricted cash, end of period	52,368,000	23,655,000
Supplemental disclosure of cash flow information:
Unpaid offering costs	208,000	185,000
Property and equipment included in accounts payable	$ 19,000	$ 51,000