CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (2,810)	$ (18,821)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	3	1,395
Amortization of financing costs	0	1,339
Stock-based compensation	274	1,824
Decrease in the carrying amount of right-of-use assets	0	947
Gain on modification of lease	0	(245)
Loss on disposal of equipment	0	10
Change in operating assets and liabilities:
Receivables	(3)	0
Prepaid expenses and other current assets	(13)	342
Deposits	0	41
Accounts payable	(251)	90
Accrued expenses	(798)	(2,095)
Lease liabilities	0	(1,182)
Other liabilities, non-current	0	(28)
Increase (decrease) in:
Net cash used in operating activities	(3,598)	(16,383)
Cash flows from investing activities:
Purchases of property and equipment	0	(196)
Proceeds from the disposal of property and equipment	0	38
Net cash used in investing activities	0	(158)
Cash flows from financing activities:
Proceeds from the issuance of common stock	0	92
Repayment of long-term debt	0	(18,105)
Debt extinguishment	0	(125)
Net cash used in financing activities	0	(18,138)
Net decrease in cash, cash equivalents and restricted cash	(3,598)	(34,679)
Cash, cash equivalents and restricted cash, beginning of period	6,062	52,996
Cash and cash equivalents, end of period	2,464	18,317
Supplementary disclosure of cash flow information:
Cash paid for interest	$ 0	$ 2,063