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Common Stock and Noncontrolling Interest in Subsidiaries - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 28, 2020
Jun. 30, 2021
Dec. 31, 2020
Nov. 30, 2020
Aug. 31, 2020
May 31, 2020
Apr. 30, 2020
Feb. 28, 2019
Dec. 31, 2018
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Common stock, shares authorized   150,000,000 34,900,878             150,000,000     150,000,000  
Dividends declared   $ 0               $ 0     $ 0  
Common stock, voting rights                         Each share of common stock entitles the holder to one vote and to receive dividends when and if declared by the board of directors of the Company.  
Shares sold/issued   43,526,224 29,831,125             43,526,224     43,526,224  
Losses attributed to noncontrolling interests                   $ (803,000)   $ (5,253,000) $ 686,000 $ (5,443,000) [1]
Aggregate purchase price [2]                           14,250,000
MICA                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares sold/issued     3,367,804                      
Shares price per share     $ 0.23                      
Aggregate purchase price     $ 800,000                      
Ownership interest percentage   45.00% 35.00%                      
MICA                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Equity at acquisition $ 12,800,000                          
Common Stock                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Additional shares issued                     13,685,000      
Series A Preferred Stock | Taiho License Agreement                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Aggregate purchase price               $ 0            
Series A Senior Preferred Stock | MICA                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Equity at acquisition 7,100,000                          
Junior Preferred and Common Stockholders | Noncontrolling Interest in Subsidiaries | MICA                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Equity at acquisition $ 5,700,000                          
Cullinan Apollo Corp                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Losses attributed to noncontrolling interests                   0   0 0 0
Cullinan Apollo Corp | Series A Preferred Stock                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares sold/issued                 7,000,000          
Gross proceeds                 $ 7,000,000.0          
Shares price per share                 $ 1.00          
Cullinan Apollo Corp | Series A Preferred Stock | Maximum                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares sold/issued                 11,000,000          
Cullinan Pearl Corp | HLBV                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Losses attributed to noncontrolling interests                   $ (500,000)   (200,000) $ 1,200,000 (400,000)
Cullinan Pearl Corp | Subscription Agreement between Company and Pearl | Common Stock                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares price per share       $ 0.44                    
Aggregate purchase price       $ 1,200,000                    
Purchase of shares       2,730,227                    
Cullinan Pearl Corp | Series A Preferred Stock                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares sold/issued         9,000,000                  
Gross proceeds         $ 9,000,000.0                  
Cullinan Pearl Corp | Series A Preferred Stock | Taiho Ventures, LLC                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares sold/issued               14,000,000            
Gross proceeds               $ 14,000,000.0            
Shares price per share               $ 1.00            
Cullinan Pearl Corp | Series A Preferred Stock | Taiho License Agreement                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares sold/issued         1,206,000     1,860,000            
Additional consideration received         $ 0                  
Cullinan Pearl Corp | Series A Preferred Stock | Maximum | Taiho Ventures, LLC                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares sold/issued               23,000,000            
Cullinan Amber Corp | HLBV                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Losses attributed to noncontrolling interests                       0   0
Cullinan Amber Corp | License Agreement between Amber and Massachusetts Institute of Technology                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares sold/issued   153,229         400,132     153,229     153,229  
Cullinan Amber Corp | License Agreement between Amber and Massachusetts Institute of Technology | Common Stock                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Additional consideration received   $ 0         $ 0              
Cullinan Amber Corp | Maximum | HLBV                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Losses attributed to noncontrolling interests                   $ (100,000)     $ (100,000)  
Cullinan Amber Corp | Series A Preferred Stock                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Gross proceeds   $ 3,000,000.0         $ 3,000,000.0              
Shares issued   3,000,000         3,000,000     3,000,000     3,000,000  
Closing price per share             $ 1.00              
Cullinan Amber Corp | Series A Preferred Stock | Maximum                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Sale of stock             9,000,000              
Cullinan Florentine Corp                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Losses attributed to noncontrolling interests                   $ 0   0 $ 0 0
Cullinan Florentine Corp | Tubingen License Agreement                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares sold/issued             725,118              
Cullinan Florentine Corp | Tubingen License Agreement | Common Stock                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Additional consideration received             $ 0              
Additional shares issued     381,810                      
Cullinan Florentine Corp | Tubingen License Agreement | Common Stock | DFKZ and UFE Anti-dilution Shares                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Additional consideration received     $ 0                      
Cullinan Florentine Corp | Series A Preferred Stock                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Gross proceeds     $ 6,000,000       $ 6,000,000.0              
Sale of stock             6,000,000              
Closing price per share             $ 1.00              
Additional shares issued     6,000,000                      
Cullinan Florentine Corp | Series A Preferred Stock | Maximum                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Sale of stock             6,000,000              
MICA | HLBV                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Losses attributed to noncontrolling interests                   $ (200,000)   $ (5,100,000) $ (500,000) $ (5,100,000)
MICA | Series A Senior Preferred Stock                            
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]                            
Shares price per share           $ 1.31                
Shares issued           6,088,282                
Number of share purchased as part of asset acquisition           5,385,787                
[1] The shares and per share amounts for the six months ended June 30, 2020 were derived from the unaudited consolidated financial statements as of that date and were retroactively adjusted as a result of the Reorganization and Reverse Stock Split. See Note 3 to the unaudited consolidated financial statements for additional details.
[2] Changes in equity activities for the six months ended June 30, 2020 were retroactively adjusted, including shares and per share amounts, as a result of the Reorganization and Reverse Stock Split. See Note 3 to the unaudited consolidated financial statements for additional details.