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	$ (8,897)	$ (6,034)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	260	224
Amortization of premium on marketable securities	0	32
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(351)	(327)
Accounts payable	187	(1,265)
Other liabilities	303	(800)
Net cash used in operating activities	(8,498)	(8,170)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales and maturities of marketable securities	0	3,104
Net cash provided by investing activities	0	3,104
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of pre-funded warrants for the purchase of common stock, net of issuance costs	0	16,666
Repurchase and retirement of common stock, amount	0	(3,000)
Net cash provided by financing activities	0	13,666
Net change in cash, cash equivalents, and restricted cash	(8,498)	8,600
Cash and cash equivalents at beginning of period	37,549	36,640
Effect of exchange rates on cash	3	4
Cash and cash equivalents at end of period	29,054	45,244
Supplemental non-cash disclosure: NONCASH INVESTING AND FINANCING ACTIVITY:
Deferred financing costs in accounts payable	0	99
Unrealized gain on available-for-sale marketable securities	$ 0	$ 136