Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
CURRENT ASSETS
Cash and cash equivalents	$ 147,630	$ 240,420
Marketable securities, short-term	206,101	135,412
Accounts receivable	374	1,153
Contract assets	1,494	1,488
Other receivables	4,169	5,483
Prepaid expenses and other current assets	8,242	7,236
Total current assets	368,010	391,192
Investments in equity securities	7,666	7,626
Marketable securities, long-term	37,092	37,676
Property and equipment - net	6,016	4,887
Operating lease, right of use asset	25,749	0
Other assets	1,464	975
TOTAL ASSETS	445,997	442,356
CURRENT LIABILITIES:
Accounts payable	1,814	3,990
Accrued expenses and other current liabilities	11,190	13,136
Lease liabilities	825	0
Deferred revenue	12,838	8,703
Total current liabilities	26,667	25,829
LONG-TERM LIABILITIES
Deferred revenue, net of current portion ($100 and $100 from related party)	17,326	22,032
Deferred rent and lease incentive liability	0	2,097
MSKCC success payments liability	2,484	4,080
Lease liabilities, non-current	27,238	0
Other liabilities	9	17
Deferred tax liabilities	476	476
Total liabilities	74,200	54,531
COMMITMENTS AND CONTINGENCIES (Note 9)
STOCKHOLDERS' EQUITY
Preferred stock, par value $0.0001 per share, 10,000,000 shares authorized at March 31, 2022 and December 31, 2021; no shares issued and outstanding as of March 31, 2022 and December 31, 2021, respectively.	0	0
Common stock, par value $0.0001 per share 300,000,000 shares authorized at March 31, 2022 and December 31, 2021, respectively; 60,689,609 and 60,263,158 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	6	6
Additional paid-in-capital	489,762	485,748
Accumulated other comprehensive loss	(1,089)	(135)
Accumulated deficit	(116,882)	(97,794)
Total stockholders' equity	371,797	387,825
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 445,997	$ 442,356