CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 98,434	$ 156,152
Short-term investments	368,633	311,140
Prepaid expenses and other current assets	13,124	7,180
Total current assets	480,191	474,472
Property and equipment, net	989	1,174
Operating lease right-of-use assets	2,543	4,130
Other assets	459	459
Long-term investments	0	80,882
Total assets	484,182	561,117
Current liabilities:
Accounts payable	2,493	2,660
Accrued expenses and other current liabilities	24,204	14,135
Income tax payable	0	4,282
Operating lease liabilities, current	1,440	1,421
Total current liabilities	28,137	22,498
Long-term liabilities:
Lease liabilities, non-current	2,150	3,590
Total liabilities	30,287	26,088
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of December 31, 2023 and 2022; 647,500 and no shares issued and outstanding as of December 31, 2023 and 2022, respectively.	0	0
Common stock, $0.0001 par value, 150,000,000 shares authorized as of December 31, 2023 and 2022; 42,900,083 and 45,796,449 shares issued and outstanding as of December 31, 2023 and 2022, respectively.	4	5
Additional paid-in capital	654,685	585,320
Accumulated other comprehensive loss	(129)	(2,601)
Accumulated deficit	(200,857)	(47,695)
Total Cullinan stockholders' equity	453,703	535,029
Noncontrolling interests	192	0
Total stockholders' equity	453,895	535,029
Total liabilities and stockholders' equity	$ 484,182	$ 561,117