CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net loss	$ (53,796)	$ (32,808)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	867	775
Amortization and premium of marketable securities, net	(2,267)	(3,313)
Loss on sale or disposal of assets	4	8
Stock-based compensation expense	9,316	7,202
Changes in operating assets and liabilities:
Accounts and other receivables	(364)	(43)
Prepaid and other current assets	1,852	(6,209)
Other assets	(662)
Accounts payable and accrued expenses	(8,718)	(4,781)
Other liabilities	(604)	(1,469)
Net cash used in operating activities	(54,372)	(40,638)
Cash flows from investing activities:
Sales and maturities of marketable securities	195,037	77,311
Purchases of marketable securities	(151,822)	(392,178)
Acquisition of property and equipment	(265)	(344)
Net cash provided by (used in) investing activities	42,950	(315,211)
Cash flows from financing activities:
Net proceeds from stock issuances		432,298
Proceeds from issuance of stock from employee benefit plans	202	3,814
Net cash provided by financing activities	202	436,112
Net (decrease) increase in cash and cash equivalents	(11,220)	80,263
Cash and cash equivalents at beginning of period	28,356	34,814
Cash and cash equivalents at end of period	17,136	115,077
Non-cash investing activities
Accrued construction in progress	$ 504	$ 105