Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net loss	$ (17,989,000)	$ (11,689,000)
Adjustments required to reconcile net loss to net cash used in operating activities:
Depreciation	421,000	578,000
Stock-based compensation	1,442,000	1,749,000
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	1,106,000	(607,000)
Accounts payable and accrued liabilities	1,622,000	100,000
Accrued compensation	621,000	652,000
Operating lease right-of-use asset and liability, net	1,781,000	97,000
Prepaid expenses and other current assets	(667,000)	(369,000)
Net cash used in operating activities	(11,663,000)	(10,013,000)
Investing activities:
Purchases of property and equipment	(1,372,000)	(494,000)
Net cash used in investing activities	(1,372,000)	(494,000)
Financing activities:
Principal payment of deferred consideration for asset acquisition		(1,414,000)
Proceeds from sale of common stock, net of offering costs	44,414,000	19,363,000
Proceeds from exercise of warrants and stock options	71,000	445,000
Net cash provided by financing activities	44,485,000	18,394,000
Net increase in cash, cash equivalents and restricted cash	31,450,000	7,887,000
Cash, cash equivalents and restricted cash, beginning of period	11,488,000	10,849,000
Cash, cash equivalents and restricted cash, end of period	42,938,000	18,736,000
Supplemental disclosure of cash flow information:
Unpaid offering costs	23,000
Property and equipment included in accounts payable	$ 85,000	$ 162,000