Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net loss	$ (31,873)	$ (26,277)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	2,964	1,951
Depreciation expense	261	566
Impairment of long-lived assets	1,592
Net amortization of premium on short-term investments	(1,352)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	1,135	788
Operating lease right-of-use assets	803	495
Other assets	(2,527)	(949)
Accounts payable	3,189	(1,639)
Accrued expenses and other current liabilities	(2,928)	1,207
Operating lease liabilities	(528)	(524)
Deferred revenue	(868)	4,007
Net cash used in operating activities	(30,132)	(20,375)
Cash flows from investing activities:
Purchases of property and equipment	(116)	(107)
Purchases of short-term investments	(29,930)
Maturity of short-term investments	34,800
Net cash provided by (used in) investing activities	4,754	(107)
Cash flows from financing activities:
Proceeds from sale of common stock and pre-funded warrants, net of issuance costs	50,000	100,495
Payment of deferred offering costs	(2,912)	(4,010)
Proceeds from exercise of stock options	101	8
Net cash provided by financing activities	47,189	96,493
Net increase in cash, cash equivalents and restricted cash	21,811	76,011
Cash, cash equivalents and restricted cash, beginning of period	33,942	46,076
Cash, cash equivalents and restricted cash, end of period	55,753	122,087
Supplemental disclosure of non-cash financing and investing activities:
Property and equipment purchases included in accounts payable	54	6
Other assets included in accounts payable and other current liabilities	505
Deferred offering costs included in accounts payable and accrued expense	$ 420	$ 236