STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Cash flows from operating activities:
Net loss	$ (25,478)	$ (24,829)	$ (72,367)	$ (68,275)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation			769	719
Stock-based compensation expense			11,303	11,330
Loss on fixed asset disposals			9	0
Accretion of discount on investments, net			(4,046)	(422)
Changes in operating assets and liabilities:
Prepaid expenses and other assets			615	(247)
Accounts payable and accrued other liabilities			2,299	(2,919)
Net cash used in operating activities			(61,418)	(59,814)
Cash flows from investing activities:
Acquisitions of property and equipment			(792)	(1,791)
Purchases of investments			(210,274)	(206,492)
Maturities of investments			146,700	70,735
Net cash provided by (used in) investing activities			(64,366)	(137,548)
Cash flows from financing activities:
Proceeds from issuance of common stock and pre-funded warrants, net			84,774	0
Proceeds from issuance of common stock under ESPP			400	354
Proceeds from stock option exercises			31	78
Net cash provided by financing activities			85,205	432
Net decrease in cash, cash equivalents and restricted cash			(40,579)	(196,930)
Cash, cash equivalents and restricted cash at beginning of period			67,308	226,474	$ 226,474
Cash, cash equivalents and restricted cash at end of period	26,729	29,544	26,729	29,544	67,308
Cash and cash equivalents	26,238	29,076	26,238	29,076	66,840
Restricted cash included in other assets	491	468	491	468
Total cash, cash equivalents and restricted cash	$ 26,729	$ 29,544	$ 26,729	$ 29,544	$ 67,308