CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 76,118	$ 59,774
Short-term investments	238,736	230,692
Prepaid expenses and other current assets	7,458	6,098
Total current assets	322,312	296,564
Property and equipment, net	64	77
Operating lease right-of-use assets	1,194	0
Other assets	147	147
Deferred tax assets	19,568
Long-term investments	94,178	140,397
Total assets	437,463	437,185
Current liabilities:
Accounts payable	6,306	3,169
Accrued expenses and other current liabilities	10,432	8,577
Operating lease liabilities, current	519	0
Total current liabilities	17,257	11,746
Long-term liabilities:
lease liabilities, non-current	736	0
Deferred rent	0	65
Total liabilities	17,993	11,811
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock, $0.0001 par value, 150,000,000 shares authorized as of March 31, 2022 and December 31, 2021; 44,660,026 and 44,292,102 shares issued and outstanding as of March 31, 2022 and December 31, 2021, respectively.	4	4
Additional paid-in capital	592,839	584,714
Accumulated other comprehensive loss	(3,134)	(838)
Accumulated deficit	(171,007)	(158,909)
Total Cullinan stockholders' equity	418,702	424,971
Noncontrolling interests	768	403
Total stockholders' equity	419,470	425,374
Total liabilities and stockholders' equity	$ 437,463	$ 437,185