CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating activities
Net loss	$ (119,943)	$ (66,317)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	26,571	16,294
Depreciation and amortization	2,159	1,708
Premiums and discounts on available-for-sale marketable securities	1,794	4,171
Loss on disposal of property and equipment		18
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(512)	(1,068)
Receivables—due from related parties		577
Contract asset—due from related parties	(2,747)	(717)
Accounts payable	2,321	1,082
Accrued expenses and other current liabilities	1,677	8,803
Deferred revenue	(24,172)	(54,217)
Operating lease right-of-use assets	378	305
Operating lease liabilities	(738)	(794)
Other assets and liabilities	(337)	(439)
Net cash (used in) provided by operating activities	(113,549)	(90,594)
Investing activities
Purchase of property and equipment, net	(2,463)	(1,096)
Purchases of investments	(298,736)	(292,006)
Maturities of investments	371,384	261,286
Net cash used in investing activities	70,185	(31,816)
Financing activities
Issuance of Common Stock and accompanying Pre-Funded Warrants at Private Placement, net of issuance costs	149,825	0
Proceeds from stock option exercises	1,790	5,874
Proceeds from employee stock purchase plan	256	307
Payments of offering costs in connection with initial public offering		(397)
Payments on finance leases	(825)	(693)
Proceeds from follow on offering, net of underwriting discounts and offering costs		240,788
Proceeds from concurrent private placement follow on		2,347
Net cash provided by financing activities	151,046	248,226
Net (decrease) increase in cash, cash equivalents and restricted cash	107,682	125,816
Cash, cash equivalents and restricted cash at beginning of period	54,092	32,593
Cash, cash equivalents and restricted cash at end of period	161,774	158,409
Supplemental disclosure of cash flow activities
Cash paid for interest	124	106
Supplemental disclosure of noncash investing and financing activities
Property and equipment purchases included in accounts payable and accrued expenses	340	65
Purchase of property and equipment through finance lease	87	1,918
Offering costs included in accrued expenses		28
Cash and cash equivalents	155,658	156,819
Restricted cash	6,116	1,590
Total cash, cash equivalents, and restricted cash	$ 161,774	$ 158,409