Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating activities:
Net loss	$ (29,491)	$ (35,709)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	381	638
Stock-based compensation expense	2,546	1,561
Noncash lease expense	1,698	1,176
Noncash interest and other expense, net	186	394
Changes in operating assets and liabilities:
Prepaid expenses and other assets	193	915
Accounts payable	(263)	1
Accrued expenses and other liabilities	(992)	1,709
Interest payable	16	(256)
Operating lease liabilities	(1,631)	(1,501)
Cash used in operating activities	(27,357)	(31,072)
Investing activities:
Purchase of property and equipment	(170)	(562)
Cash used in investing activities	(170)	(562)
Financing activities:
Proceeds from the issuance of common stock, net of issuance costs	35,602	8,861
Proceeds from issuance of pre-funded warrants, net of issuance costs	0	7,281
Repayment of loan		(4,739)
Cash provided by financing activities	35,602	11,403
Net increase in cash and cash equivalents	8,075	(20,231)
Cash, cash equivalents and restricted cash at beginning of period	31,598	51,829
Cash, cash equivalents and restricted cash at end of period	39,673	31,598
Supplemental disclosure of cash flow information:
Cash paid for interest	1,249	1,539
Cash paid for business taxes	191	18
Operating lease right-of-use assets recognized in exchange for lease liabilities		10,660
Non-cash operating activities:
Lease modification		884
Non-cash investing activities:
Property and equipment in accounts payable	$ 0	$ 93