Condensed Consolidated Statements of Cash Flows (Unaudited) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (45,785)	$ (27,470)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	666	451
Loss on disposal of fixed assets	0	3
Non-cash consideration for licensing and collaboration revenue	(205)	0
Change in fair value of equity securities	104	0
Stock-based compensation expense	5,942	936
Change in fair value of MSKCC success payments liability	(2,648)	1,181
Acquired in-process research and development	300	1,000
Extinguishment of PPP Loan	0	(1,578)
Amortization of investment premiums	449	0
Non-cash lease expense	1,000	0
Changes in operating assets and liabilities:
Accounts receivable	629	148
Contract assets	(606)	498
Other receivables	2,388	(3,894)
Prepaid expenses and other current assets	(347)	(1,842)
Other assets	(326)	(151)
Accounts payable	(3,557)	1,031
Accrued expenses and other current liabilities	1,117	1,009
Deferred revenue, current and long-term	(2,470)	31,791
Deferred rent and lease incentive liability	0	738
Operating lease liabilities	(182)	0
Other liabilities	(15)	(14)
Net cash (used in) provided by operating activities	(43,546)	3,837
CASH FLOWS FROM INVESTING ACTIVITIES:
Maturities of marketable securities	99,009	0
Purchases of marketable securities	(181,746)	0
Purchases of property and equipment	(3,343)	(506)
Net cash used in investing activities	(86,080)	(506)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of Series C convertible preferred stock, net of issuance costs	0	108,827
Proceeds from exercise of stock options and purchases of common stock under employee stock purchase plan	1,352	1,130
Repayment of promissory note	0	1,150
Payments on capital lease	0	(119)
Payment of deferred issuance costs	0	(702)
Net cash provided by financing activities	1,352	110,286
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(128,274)	113,617
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH - BEGINNING OF PERIOD	240,420	15,953
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH - END OF PERIOD	112,146	129,570
RECONCILIATION OF CASH, CASH EQUIVALENTS, AND RESTRICTED CASH
Cash and cash equivalents	112,146	129,524
Restricted cash	46	46
TOTAL CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	112,192	129,570
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for income taxes	0	11
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITES:
Acquisition of property and equipment included in accrued expenses and other current liabilities	707	869
Deferred issuance costs related to initial public offering unpaid at period end	0	1,884
Acquired in-process research and development accrued	300	1,000
Extinguishment of PPP Loan	0	1,578
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 26,249	$ 0