Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (21,066)	$ (19,827)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	32	38
Change in fair value of derivative liability associated with contingently issuable warrants		15
Non-cash interest expense related to term loan	196	139
Impairment of assets related to supply manufacturing agreements	8,199
Stock-based compensation expense	1,037	2,350
Changes in operating assets and liabilities:
Prepaid expenses and other assets	1,202	2,375
Accounts payable	664	1,075
Accrued expenses and other liabilities	(1,629)	(2,089)
Net cash used in operating activities	(11,365)	(15,924)
Cash flows from financing activities:
Repayment of principal portion of finance lease	(265)
Proceeds from issuance of term loan, net of issuance costs paid to lender		10,000
Payment of debt issuance costs	(2)	(13)
Payment of offering costs		(27)
Net cash provided by financing activities	(267)	9,960
Net decrease in cash, cash equivalents and restricted cash	(11,632)	(5,964)
Cash, cash equivalents and restricted cash, at beginning of period	56,384	106,321
Cash, cash equivalents and restricted cash, at end of period	44,752	100,357
Supplemental disclosure of cash flow information:
Cash paid for interest	822	298
Supplemental disclosure of non-cash investing and financing activities:
Right-of-use asset recognized in exchange for finance lease obligations	$ 2,344
Deferred offering costs not yet paid		95
Debt issuance costs not yet paid		2
Issuance of warrants in connection with term loan financing		$ 206