Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net Income (Loss)	$ (69,134)	$ (55,325)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	353	296
Stock-based compensation	13,525	10,588
Accretion on marketable securities, net	(1,247)	0
Loss on disposal of property and equipment	4	3
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(2,823)	(8,238)
Accounts payable, accrued expenses and other liabilities (including related party amounts of $0 and $17, respectively)	9,369	2,357
Right-of-use assets and lease liabilities, net	(186)	34
Net cash used in operating activities	(50,139)	(50,285)
Cash flows from investing activities:
Purchases of marketable securities	(143,835)	0
Purchases of property and equipment	(770)	(559)
Net cash used in investing activities	(144,605)	(559)
Cash flows from financing activities:
Proceeds from issuances of common stock under benefit plans	1,537	632
Net cash provided by financing activities	1,537	632
Net cash decrease for the period	(193,207)	(50,212)
Cash, cash equivalents and restricted cash at beginning of the period	252,213	302,425
Cash, cash equivalents and restricted cash at end of the period	59,006	252,213
Reconciliation of cash, cash equivalents and restricted cash to the balance sheet
Cash and cash equivalents	58,006	251,213
Restricted cash	1,000	1,000
Total cash, cash equivalents and restricted cash	59,006	252,213
Supplemental disclosure of cash flow information:
Right-of-use asset obtained in exchange for lease liability	4,405	1,572
Non-cash investing and financing activities:
Purchases of equipment included in accounts payable and accrued expenses	125	0
Vesting of options early exercised subject to repurchase	$ 124	$ 197