Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net loss	$ (117,255)	$ (81,828)	$ (41,567)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation expense	1,515	691	249
Non-cash operating lease expense	2,686	571	704
Stock-based compensation expense	14,131	10,336	6,234
Net amortization of premiums and accretion of discounts on investments	1	144	516
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	2,478	(1,725)	(2,517)
Other assets	(2,358)	(1,915)	(1,218)
Accounts payable	2,562	2,960	640
Accrued expenses and other current liabilities	1,886	8,914	2,110
Operating lease liabilities	(2,238)	(565)	(589)
Net cash used in operating activities	(96,592)	(62,417)	(35,438)
Cash flows from investing activities
Purchase of property and equipment	(3,370)	(1,030)	(3,171)
Purchase of investments			(38,492)
Maturities of investments	1,150	28,371	8,308
Net cash (used in) provided by investing activities	(2,220)	27,341	(33,355)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	161,803
Proceeds from issuance of common stock from initial public offering, net of issuance costs			152,753
Proceeds from exercise of stock options and purchases under the employee stock purchase plan	1,995	1,239	468
Payment from Paycheck Protection Program loan			(36)
Net cash provided by financing activities	163,798	1,239	153,185
Net increase (net decrease) in cash, cash equivalents, and restricted cash	64,986	(33,837)	84,392
Cash, cash equivalents, and restricted cash at the beginning of the period	112,250	146,087	61,695
Cash, cash equivalents, and restricted cash at the end of the period	177,236	112,250	146,087
Non-cash financing and investing activities:
Acquisition of operating lease right-of-use assets	5,971		3,216
Acquisition of property and equipment included in accounts payable and accrued expenses and other current liabilities		2,537
Remeasurement of operating lease right-of-use assets and lease liability	5,668
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	176,866	111,899	145,736
Restricted cash	370	351	351
Cash, cash equivalents, and restricted cash at the end of the period	$ 177,236	$ 112,250	$ 146,087