Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net loss	$ (47,524)	$ (41,043)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	4,405	3,690
Depreciation expense	193	845
Impairment of long-lived assets	1,592
Net amortization of premium on short-term investments	(2,408)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	565	(172)
Operating lease right-of-use assets	1,080	747
Other assets	(3,240)	(787)
Accounts payable	3,985	(167)
Accrued expenses and other current liabilities	(625)	2,814
Operating lease liabilities	(857)	(796)
Deferred revenue	(1,412)	3,648
Net cash used in operating activities	(44,246)	(31,221)
Cash flows from investing activities:
Purchases of property and equipment	(260)	(136)
Purchases of short-term investments	(72,765)
Maturity of short-term investments	62,800
Net cash used in investing activities	(10,225)	(136)
Cash flows from financing activities:
Proceeds from sale of common stock and pre-funded warrants	50,000	100,495
Payment of deferred offering costs	(3,332)	(4,246)
Proceeds from exercise of stock options	103	8
Net cash provided by financing activities	46,771	96,257
Net (decrease) increase in cash, cash equivalents and restricted cash	(7,700)	64,900
Cash, cash equivalents and restricted cash, beginning of period	33,942	46,076
Cash, cash equivalents and restricted cash, end of period	26,242	110,976
Supplemental disclosure of non-cash financing and investing activities:
Property and equipment purchases included in accounts payable	8
Issuance costs in accounts payable, accrued expenses, and other current liabilities	150
Other assets included in accounts payable and other current liabilities	2,740	$ 249
Deferred offering costs included in accounts payable and accrued expense	$ 161