CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net Income (Loss)	$ (70,690)	$ (188,679)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	2,040	1,321
Loss on disposal of property and equipment	174	3
Noncash operating lease expense	1,010	903
Right of use asset expensed	18,871	63,278
Amortization of premiums and discounts on marketable securities	(11,048)	(2,125)
Share-based compensation	41,789	21,544
Changes in operating assets and liabilities:
Prepaid expenses and other current and non-current assets	(8,359)	(5,695)
Accounts payable and other current liabilities	(6,474)	7,419
Accrued liabilities	5,593	(395)
Operating lease liabilities	13,461	3,123
Contract liability to related party	221,206
Net cash provided by (used in) operating activities	207,573	(99,303)
Cash flows from investing activities
Purchases of property and equipment	(21,428)	(2,277)
Purchases of marketable securities	(442,429)	(273,737)
Proceeds from maturities of marketable securities	309,345	158,340
Net cash used in investing activities	(154,512)	(117,674)
Cash flows from financing activities
Proceeds from issuance of common stock (initial public offering), net of transactions costs		129,156
Proceeds from issuance of common stock in private placement, net of transactions costs	299,706	9,958
Proceeds from issuance of common stock (follow-on offering), net of transactions costs		120,719
Proceeds from exercise of stock options and early exercise of restricted stock	7,758	2,467
Proceeds from issuance of common stock under the employee stock purchase plan	1,091
Payments under finance leases	(29,392)	(9,675)
Net cash provided by financing activities	279,163	252,625
Net increase in cash and cash equivalents and restricted cash	332,224	35,648
Cash and cash equivalents and restricted cash, beginning of the year	66,680	31,032
Cash and cash equivalents and restricted cash, end of the period	398,904	66,680
Supplemental disclosures of cash flow information:
Cash paid for income taxes	212
Supplemental disclosures of noncash investing and financing activities:
Purchase of property and equipment included in accounts payable and accrued liabilities	$ 1,841	$ 770