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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Operating expenses:        
Research and development $ 44,437 $ 61,030 $ 86,560 $ 102,489
General and administrative expense 12,817 14,768 24,391 28,305
Total operating expenses 57,254 75,798 110,951 130,794
Loss from operations (57,254) (75,798) (110,951) (130,794)
Other income (expense):        
Interest income 3,648 5,924 7,746 12,504
Other expense, net (98) (181) (160) (266)
Total other income 3,550 5,743 7,586 12,238
Net loss (53,704) (70,055) (103,365) (118,556)
Comprehensive income (loss):        
Net Loss (53,704) (70,055) (103,365) (118,556)
Unrealized gain (loss) on investments (261) 102 (1,154) 740
Comprehensive loss $ (53,965) $ (69,953) $ (104,519) $ (117,816)
Common Stock        
Basic and diluted net loss per share attributable to Cullinan:        
Net loss per share, basic $ (0.81) $ (1.07) $ (1.56) $ (1.81)
Net loss per share, diluted $ (0.81) $ (1.07) $ (1.56) $ (1.81)
Weighted-average shares used in computing basic and diluted net loss per share attributable to Cullinan:        
Weighted-average shares outstanding - basic 61,493 59,015 60,980 58,960
Weighted-average shares outstanding - diluted 61,493 59,015 60,980 58,960
Preferred Stock        
Basic and diluted net loss per share attributable to Cullinan:        
Net loss per share, basic $ (8.1) $ (10.7) $ (15.63) $ (18.12)
Net loss per share, diluted $ (8.1) $ (10.7) $ (15.63) $ (18.12)
Weighted-average shares used in computing basic and diluted net loss per share attributable to Cullinan:        
Weighted-average shares outstanding - basic 479 648 517 648
Weighted-average shares outstanding - diluted 479 648 517 648