Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (76,896)	$ (57,518)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	11,250	7,477
Depreciation and amortization expense	124	107
Amortization of debt issuance costs and discount	433	0
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	788	121
Accounts payable	(11,703)	1,400
Accrued expense	(5,894)	(1,606)
Accrued interest, net of interest received on maturity of investments	(2,169)	106
Net cash used in operating activities	(84,067)	(49,913)
Cash flows from investing activities:
Purchases of marketable securities	(198,822)	(37,567)
Sales and maturities of marketable securities	11,993	93,545
Purchases of property and equipment, net of disposals	(35)	(52)
Net cash provided by (used in) investing activities	(186,864)	55,926
Cash flows from financing activities:
Proceeds from the sale of related party stock and exercise of common stock options, net of transaction costs	17,903	0
Proceeds from issuance of loan payable	35,000	0
Payment of debt issuance costs	(213)	0
Net cash provided by financing activities	52,690	0
Net increase (decrease) in cash and cash equivalents	(218,241)	6,013
Cash and cash equivalents at beginning of period	331,549	36,269
Cash and cash equivalents at end of period	$ 113,308	$ 42,282