CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 82,271	$ 76,333
Collaboration receivable, current - related party	49,198	49,152
Other receivables	5,017	1,545
Prepaid expenses and other current assets	3,668	4,178
Total current assets	140,154	131,208
Property and equipment, net	2	2
Operating lease right of use assets	3,902	4,155
Collaboration receivable, non-current - related party	23,211	46,590
Other assets	434	435
Total assets	167,703	182,390
Current liabilities:
Accounts payable	3,066	1,378
Accrued expenses and other current liabilities	5,380	6,557
Operating lease liabilities	1,725	1,718
Income taxes payable	387	387
Deferred revenue, current	2,868	2,132
Deferred revenue, current - related party	28,395	24,981
Total current liabilities	41,821	37,153
Non-current operating lease liabilities	3,519	3,825
Deferred revenue, non-current	9,948	10,825
Deferred revenue, non-current - related party	16,128	23,606
Other long-term liabilities	38	87
Total liabilities	71,454	75,496
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized, no shares issued and outstanding as of March 31, 2024 and December 31, 2023	0	0
Common stock, $0.001 par value; 120,000,000 shares authorized as of March 31, 2024 and December 31, 2023; 53,869,139 shares issued and outstanding as of March 31, 2024 and 52,999,680 shares issued and outstanding as of December 31, 2023	54	53
Additional paid-in capital	499,936	497,913
Accumulated deficit	(403,741)	(391,072)
Total stockholders' equity	96,249	106,894
Total liabilities and stockholders' equity	$ 167,703	$ 182,390