Unaudited Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net loss	$ (46,535)	$ (46,994)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	1,424	438
Stock-based compensation	15,522	12,998
Accretion of discounts on investments, net	(5,627)	(891)
Changes in operating assets and liabilities:
Accounts receivable	0	(500)
Prepaid expenses and other current assets	(60)	(3,288)
Other long-term assets	(924)	(957)
Accounts payable	(50)	(517)
Accrued expenses	(1,104)	3,151
Deferred revenue	(3,979)	3,859
Operating lease right-of-use assets and liabilities, net	659	1,692
Net cash used in operating activities	(40,674)	(31,009)
Cash flows from investing activities
Purchases of property and equipment	(1,335)	(4,389)
Purchases of short-term investments	(284,232)	(208,341)
Maturities of short-term investments	233,250	272,600
Net cash provided by (used in) investing activities	(52,317)	59,870
Cash flows from financing activities
Proceeds from exercise of vested common stock options and employee stock purchase plan	2,187	309
Proceeds from the issuance of common stock and pre-funded common stock warrants, net of issuance costs	56,530	0
Net cash provided by financing activities	58,717	309
Net increase (decrease) in cash, cash equivalents and restricted cash	(34,274)	29,170
Cash, cash equivalents and restricted cash -- beginning of period	52,242	36,398
Cash, cash equivalents and restricted cash -- end of period	17,968	65,568
Supplemental disclosure of noncash investing and financing activities
Unpaid property and equipment	430	1,189
Vesting of restricted common stock	144	880
Unrealized gain (loss) on available-for-sale securities, net	360	(2,007)
Operating lease liabilities arising from right-of-use assets	$ 0	$ 23,078