CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net loss	$ (18,821)	$ (19,720)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	1,395	1,374
Amortization of financing costs	1,339	405
Stock-based compensation	1,824	1,843
Decrease in the carrying amount of right-of-use assets	947	2,196
Gain on lease modification	(245)	(133)
Loss on disposal of equipment	10	0
Decrease in:
Receivables	0	1,111
Prepaid expenses and other current assets	342	316
Deposits	41	0
Other assets, non-current	0	131
Increase (decrease) in:
Accounts payable	90	(894)
Accrued expenses	(2,095)	(368)
Lease liabilities	(1,182)	(2,246)
Other liabilities, non-current	(28)	28
Net cash used in operating activities	(16,383)	(15,957)
Cash flows from investing activities:
Purchases of property and equipment	(196)	(86)
Proceeds from the disposal of property and equipment	38	0
Net cash used in investing activities	(158)	(86)
Cash flows from financing activities:
Proceeds from the issuance of common stock	92	0
Repayment of long-term debt	(18,105)	0
Debt extinguishment costs	(125)	0
Net cash used in financing activities	(18,138)	0
Net decrease in cash, cash equivalents and restricted cash	(34,679)	(16,043)
Cash, cash equivalents and restricted cash, beginning of period	52,996	76,054
Cash and cash equivalents, end of period	18,317	60,011
Supplementary disclosure of cash flow information:
Cash paid for interest	2,063	1,002
Amounts included in accrued expenses related to property and equipment	$ 0	$ 17