CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 83,005	$ 98,434
Short-term investments	315,972	368,633
Prepaid expenses and other current assets	15,691	13,124
Total current assets	414,668	480,191
Property and equipment, net	683	989
Operating lease right-of-use assets	1,667	2,543
Other assets	366	459
Long-term investments	204,440	0
Total assets	621,824	484,182
Current liabilities:
Accounts payable	1,682	2,493
Accrued expenses and other current liabilities	27,663	24,204
Operating lease liabilities, current	1,302	1,440
Total current liabilities	30,647	28,137
Long-term liabilities:
Operating lease liabilities, net of current portion	849	2,150
Total liabilities	31,496	30,287
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of December 31, 2024 and 2023; 647,500 shares issued and outstanding as of December 31, 2024 and 2023, respectively.	0	0
Common stock, $0.0001 par value, 150,000,000 shares authorized as of December 31, 2024 and 2023; 58,510,610 and 42,900,083 shares issued and outstanding as of December 31, 2024 and 2023, respectively.	6	4
Additional paid-in capital	958,695	654,685
Accumulated other comprehensive loss	(133)	(129)
Accumulated deficit	(368,240)	(200,857)
Total Cullinan stockholders' equity	590,328	453,703
Noncontrolling interests	0	192
Total stockholders' equity	590,328	453,895
Total liabilities and stockholders' equity	$ 621,824	$ 484,182