STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows used in operating activities:
Net loss	$ (66,171)	$ (58,149)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	878	559
Noncash lease expense	811	874
Stock-based compensation	11,645	12,989
Amortization of premium and discount on marketable securities, net	(2,873)	(805)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(216)	(2,540)
Accounts payable	1,708	(1,333)
Deferred revenue	3,000
Accrued expenses and other liabilities	(4,466)	(4,493)
Long-term prepaid expenses and other long-term assets		(4,010)
Operating lease liabilities	836	(894)
Net cash used in operating activities	(54,848)	(57,802)
Cash flows provided by investing activities:
Purchases of marketable securities	(13,372)	(128,134)
Proceeds from maturities of marketable securities	71,360	72,500
Purchases of property and equipment	(648)	(1,793)
Net cash provided by (used in) investing activities	57,340	(57,427)
Cash flows used in financing activities:
Payment of offering costs	(84)
Proceeds from issuance of common stock and pre-funded warrants, net of offering costs		110,691
Proceeds from the issuance of common stock under ESPP	255	348
Proceeds from the issuance of common stock in connection with the exercise of stock options	4	31
Payment of withholding taxes related to stock-based compensation to employees	(34)
Principal payments on finance lease liabilities	(96)
Net cash provided by financing activities	45	111,070
Net increase (decrease) in cash, cash equivalents and restricted cash	2,537	(4,159)
Cash, cash equivalents, and restricted cash at beginning of period	29,335	34,649
Cash, cash equivalents, and restricted cash at end of period	31,872	30,490
Supplemental disclosures of non-cash activities:
Property and equipment in accounts payable and accrued expenses and other current liabilities	19	30
Offering costs in accrued expenses and other current liabilities		67
Offering costs in accounts payable	26	201
Unrealized (loss) gain on marketable securities	$ (513)	$ 981