CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (46,342)	$ (48,039)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	765	528
Stock-based compensation expense	5,310	4,132
Accretion of premium/discount on marketable securities	693	1,011
Change in fair value of convertible preferred stock purchase rights liabilities		6,084
Non-cash lease expense	1,838	1,174
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(1,941)	(632)
Accounts payable and accrued expenses	(3,087)	4,110
Operating lease liabilities	(1,461)	(278)
Deferred revenue	(870)	11,363
Other long-term liabilities	(6)	2
Net cash used in operating activities	(45,101)	(20,545)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(1,034)	(761)
Purchases of marketable securities	(107,433)	(247,768)
Maturities of marketable securities	148,444	11,406
Net cash provided by (used in) investing activities	39,977	(237,123)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of preferred stock, net of issuance cost		51,902
Proceeds from initial public offering, net of issuance cost		244,316
Proceeds from issuance of common stock related to stock purchase agreement		13,638
Proceeds from issuance of common stock	359	572
Net cash provided by financing activities	359	310,428
Net (decrease) increase in cash	(4,765)	52,760
Cash, cash equivalents and restricted cash at beginning of year	28,948	7,107
Cash, cash equivalents and restricted cash at end of period	24,183	59,867
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	22,618	58,302
Restricted cash	1,565	1,565
Total cash, cash equivalents and restricted cash	24,183	59,867
Supplemental schedule of non-cash investing and financing activities:
Vesting of early exercised options	4	98
Purchases of property and equipment included in accounts payable and accrued liabilities	98	226
Deferred offering costs in accounts payable and accrued liabilities	$ 102
Right of use assets obtained in exchange for operating lease obligations		$ 14,884