Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating activities
Net Income (Loss)	$ (18,971)	$ (24,693)
Adjustments to reconcile net loss to net cash used in by operating activities:
Share-based compensation expense	3,213	4,089
Depreciation and amortization	206	241
Amortization of premiums and accretion of discounts on short-term investments, net	(560)	(1,061)
Change in operating assets and liabilities:
Prepaid expenses and other assets	206	1,016
Other assets	1,220	283
Accounts payable	(1,155)	695
Accrued expenses	(1,829)	97
Operating lease liabilities, net	(6)	3
Net cash used in operating activities	(17,676)	(19,330)
Investing activities
Purchase of property and equipment	0	(189)
Purchases of short-term investments	(9,643)	(41,453)
Proceeds from maturity of short-term investments	35,538	38,272
Net cash provided by (used in) investing activities	25,895	(3,370)
Financing activities
Issuance of common stock, net of issuance costs	80	127
Issuance of common stock upon option exercises and from employee stock plan	44	93
Payments on borrowings of debt	(6,679)	0
Net cash provided by (used in) financing activities	(6,555)	220
Net increase (decrease) in cash and cash equivalents	1,664	(22,480)
Cash and cash equivalents at beginning of period	12,317	36,773
Cash and cash equivalents at end of period	13,981	14,293
Supplemental disclosure of cash flow information
Interest paid	1,485	1,378
Interest received	1,134	1,733
Supplemental disclosure of noncash activities
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 0	$ 381