Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net loss	$ (96,792)	$ (81,478)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	37,271	35,073
Depreciation and amortization expense	312	156
Accretion of premium and discounts on marketable securities	(11,101)	(2,465)
Changes in operating assets and liabilities:
Accounts receivable		(4,514)
Prepaid expenses and other current assets	6,023	(4,484)
Other assets	98
Accounts payable	(2,156)	(3,416)
Accrued expenses and other liabilities	2,904	(39,109)
Operating lease liabilities	(120)	800
Net cash used in operating activities	(63,561)	(99,437)
Cash flows from investing activities
Additions to property and equipment		(1,943)
Purchases of marketable securities	(515,132)	(486,955)
Sales and maturities of marketable securities	527,664	0
Net cash provided by (used in) investing activities	12,532	(488,898)
Cash flows from financing activities
Proceeds from issuance of common stock for exercise of stock options		230
Proceeds from issuance of common stock under ESPP	257	140
Net cash provided by financing activities	257	370
Net decrease in cash, cash equivalents and restricted cash	(50,772)	(587,965)
Cash, cash equivalents and restricted cash at the beginning of period	188,658	764,680
Cash, cash equivalents and restricted cash at the end of period	137,886	176,715
Cash, cash equivalents and restricted cash at the end of period:
Cash and cash equivalents	137,886	176,410
Restricted cash		305
Total cash, cash equivalents and restricted cash	$ 137,886	176,715
Supplemental cash flow information:
Right of use assets obtained in exchange for operating lease liabilities		$ 2,938