Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities
Net loss	$ (21,439)	$ (38,349)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation of equipment	21	269
Gain on sale of equipment		(64)
Stock-based compensation	3,239	5,427
Issuance of common stock in connection with vesting of restricted stock units	93
Issuance of preferred and common stock in connection with an Asset Purchase Agreement	1,890
Amortization of premiums and discounts on marketable securities	70	(431)
Amortization of right of use lease asset	160	561
Accretion of lease liability	10	46
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	954	65
Other assets, noncurrent	970	1,148
Accounts payable	(1,325)	(1,648)
Accrued expenses and other current liabilities	(3,139)	(3,335)
Operating lease liabilities	(170)	(600)
Other liabilities, noncurrent	43
Net cash used in operating activities	(18,623)	(36,911)
Cash flows from investing activities
Purchases of marketable securities		(25,937)
Proceeds from sale of marketable securities	11,650	48,184
Proceeds from the sale of equipment		83
Net cash provided by investing activities	11,650	22,330
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs		2,876
Net cash provided by financing activities		2,876
Net decrease in cash and cash equivalents	(6,973)	(11,705)
Effect of exchange rate changes on cash and cash equivalents	(317)	384
Cash and cash equivalents, beginning of year	21,465	32,786
Cash and cash equivalents, end of year	14,175	$ 21,465
Supplemental disclosures of noncash activities:
Operating lease liability arising from obtaining right-of-use assets	$ 75