Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (10,137)	$ (9,801)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	132	135
Amortization of intangible assets	167	167
Stock-based compensation	1,759	896
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	7	160
Other receivables	(7)	(1)
Right-of-use assets	216	193
Accounts payable	(124)	587
Accrued expenses	(1,546)	496
Deferred revenue	0	4
Lease liabilities	(247)	(207)
Accrued interest on related party note payable	0	801
Net cash used in operating activities	(9,780)	(6,570)
Cash flows from investing activities:
Purchases of property and equipment	(5)	(39)
Net cash used in investing activities	(5)	(39)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock purchase plan	296	291
Proceeds from exercises of warrants	0	194
Proceeds from exercises of stock options	9	0
Payments made on related party note	0	(917)
Net cash provided by (used in) financing activities	305	(432)
Net decrease in cash and cash equivalents	(9,480)	(7,041)
Cash and cash equivalents at beginning of period	44,365	61,139
Cash and cash equivalents at end of period	$ 34,885	$ 54,098