CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net loss	$ (3,937)	$ (27,297)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	3	2,074
Property and equipment right-of-use asset impairment	0	1,011
Amortization of financing costs	0	1,339
Stock-based compensation	354	2,550
Decrease in the carrying amount of right-of-use assets	0	1,332
Gain on lease modification	0	(245)
Loss on disposal of equipment	0	12
Change in operating assets and liabilities:
Receivables	1	4
Prepaid expenses and other current assets	331	(126)
Deposits	0	42
Accounts payable	(159)	(92)
Accrued expenses	(972)	(2,258)
Lease liabilities	0	(1,575)
Other liabilities, non-current	0	472
Increase (decrease) in:
Net cash used in operating activities	(4,379)	(22,757)
Cash flows from investing activities:
Purchases of property and equipment	0	(197)
Proceeds from the disposal of property and equipment	0	40
Net cash used in investing activities	0	(157)
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	(4,379)	(41,052)
Cash, cash equivalents and restricted cash, beginning of period	6,062	52,996
Cash and cash equivalents, end of period	1,683	11,944
Supplementary disclosure of cash flow information:
Cash paid for interest	$ 0	$ 2,063