Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities:
Net loss	$ (18,037,000)	$ (17,989,000)
Adjustments required to reconcile net loss to net cash used in operating activities:
Depreciation	458,000	421,000
Share-based compensation	1,118,000	1,442,000
Change in fair value of convertible debt	(2,874,000)
Changes in operating assets and liabilities:
Accounts payable and accrued liabilities	116,000	1,622,000
Accrued compensation	(730,000)	621,000
Operating lease right-of-use asset and liability, net	(7,474,000)	1,781,000
Prepaid expenses and other current assets	(2,207,000)	439,000
Net cash used in operating activities	(29,630,000)	(11,663,000)
Investing activities:
Purchases of property and equipment	(2,232,000)	(1,372,000)
Net cash used in investing activities	(2,232,000)	(1,372,000)
Financing activities:
Proceeds from issuance of convertible debt, net of issuance costs	29,226,000
Proceeds from sale of common stock, net of offering costs		44,414,000
Proceeds from exercise of warrants and stock options		71,000
Net cash provided by financing activities	29,226,000	44,485,000
Net increase in cash, cash equivalents and restricted cash	(2,636,000)	31,450,000
Cash, cash equivalents and restricted cash, beginning of period	20,812,000	11,488,000
Cash, cash equivalents and restricted cash, end of period	18,176,000	42,938,000
Supplemental disclosure of cash flow information:
Unpaid offering costs		23,000
Property and equipment included in accounts payable	$ 3,416,000	$ 85,000