Unaudited Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities
Net loss	$ (34,967)	$ (30,298)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	924	189
Stock-based compensation	10,974	8,402
Accretion of discounts on investments, net	(3,519)	(123)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(590)	(1,987)
Other long-term assets	(1,043)	185
Accounts payable	(278)	117
Accrued expenses	883	264
Deferred revenue	(1,980)	4,797
Operating lease right-of-use assets and liabilities, net	631	859
Net cash used in operating activities	(28,965)	(17,595)
Cash flows from investing activities
Purchases of property and equipment	(865)	(1,869)
Purchases of short-term investments	(148,251)	(113,874)
Maturities of short-term investments	158,250	155,850
Net cash provided by investing activities	9,134	40,107
Cash flows from financing activities
Proceeds from exercise of vested and unvested common stock options and employee stock purchase plan	2,108	309
Net cash provided by financing activities	2,108	309
Net increase (decrease) in cash, cash equivalents and restricted cash	(17,723)	22,821
Cash, cash equivalents and restricted cash -- beginning of period	52,242	36,398
Cash, cash equivalents and restricted cash -- end of period	34,519	59,219
Supplemental disclosure of noncash investing and financing activities
Unpaid property and equipment	460	463
Vesting of restricted common stock	139	711
Unrealized gain (loss) on available-for-sale securities, net	475	(1,637)
Operating lease liabilities arising from right-of-use assets	$ 0	$ 23,078