CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net loss	$ (31,062)	$ (22,521)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,687	1,410
Depreciation	729	764
Non-cash lease expense	880
Amortization of available-for-sale securities	517	357
Changes in operating assets and liabilities:
Accounts receivable from related party	1,402	(482)
Prepaid expenses and other current assets	(1,715)	(1,534)
Other long-term assets	(104)
Accounts payable	(2,097)	10
Accrued expenses and other current liabilities	686	1,356
Deferred collaboration liability	(5,222)	(948)
Deferred rent and lease incentive		(288)
Operating lease liability	(1,139)
Other long-term liabilities	23	(79)
Net cash used in operating activities	(35,415)	(21,955)
Investing activities
Purchases of available-for-sale securities	(39,250)	(147,223)
Proceeds from maturities and redemptions of available-for-sale securities	94,918	26,530
Proceeds from sale of property and equipment		42
Purchases of property and equipment	(221)	(102)
Net cash provided by (used in) investing activities	55,447	(120,753)
Financing activities
Proceeds from the issuance of Series D convertible preferred stock		27,400
Proceeds from issuance of common stock upon completion of initial public offering net of commissions and underwriting discounts		128,240
Payment of initial public offering costs		(3,255)
Proceeds from the exercise of stock options		18
Principal payments on finance lease liability	(104)	(94)
Repurchases of early exercised restricted stock		(1)
Net cash (used in) provided by financing activities	(104)	152,308
Net increase in cash, cash equivalents and restricted cash	19,928	9,600
Cash, cash equivalents and restricted cash at beginning of period	37,583	29,218
Cash, cash equivalents and restricted cash at end of period	57,511	38,818
Supplemental disclosure of non-cash activities:
Operating lease right-of-use asset recognized upon adoption of ASC 842	$ 11,485
Vesting of early exercised restricted stock		$ (9)