Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating Activities
Net loss			$ (109,124)	$ (82,371)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation expense	$ 400	$ 400	1,279	1,095
Non-cash operating lease expense			2,096	1,976
Stock-based compensation expense			14,604	10,267
Net amortization of premiums and accretion of discounts on investments				1
Changes in operating assets and liabilities:
Prepaid expenses and other current assets			(3,331)	1,356
Other assets			874	(1,684)
Accounts payable			2,068	(1,099)
Accrued expenses and other current liabilities			2,350	(1,466)
Operating lease liabilities			(706)	(1,830)
Net cash used in operating activities			(89,890)	(73,755)
Investing Activities
Purchase of property and equipment			(280)	(3,362)
Maturities of investments				1,150
Net cash used in investing activities			(280)	(2,212)
Financing Activities
Proceeds from issuance of common stock from public offering, net of offering costs				161,803
Proceeds from stock option exercise and purchases under the employee stock purchase plan			1,255	1,373
Net cash provided by financing activities			1,255	163,176
Net (decrease) increase in cash, cash equivalents, and restricted cash			(88,915)	87,209
Cash, cash equivalents, and restricted cash at the beginning of the period			177,236	112,250
Cash, cash equivalents, and restricted cash at the end of the period	88,321	199,459	88,321	199,459
Non-cash financing and investing activities:
Acquisition of operating lease right-of-use assets				11,639
Acquisition of property and equipment in accounts payable and accrued liabilities			68	4
Reconciliation of cash and cash equivalents, and restricted cash:
Cash and cash equivalents	87,952	199,090	87,952	199,090
Restricted cash	369	369	369	369
Cash, cash equivalents, and restricted cash at the end of the period	$ 88,321	$ 199,459	$ 88,321	$ 199,459