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License and Asset Acquisitions - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
May 11, 2020
Sep. 21, 2018
Jun. 24, 2018
Jan. 04, 2018
Oct. 02, 2017
May 31, 2019
Sep. 30, 2018
Oct. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                      
In process research and development                 $ 23,380,000 $ 3,600,000 $ 49,659,000
Seralutinib                      
Business Acquisition [Line Items]                      
In process research and development                 5,000,000 0 0
GB001                      
Business Acquisition [Line Items]                      
In process research and development                 0 0 19,148,000
GB004                      
Business Acquisition [Line Items]                      
In process research and development                 15,000,000 0 20,000,000
GB1275                      
Business Acquisition [Line Items]                      
In process research and development                 0 $ 1,000,000 $ 7,501,000
Pulmokine, Inc. | License Agreement | Seralutinib                      
Business Acquisition [Line Items]                      
Product license term         10 years            
Upfront payment               $ 5,500,000      
Milestones accrued                 5,000,000.0    
Pulmokine, Inc. | License Agreement | Seralutinib | Maximum                      
Business Acquisition [Line Items]                      
Development and regulatory milestone payments, payable         $ 58,000,000.0            
Commercial milestone payments, payable         45,000,000.0            
Sales milestone payments, payable         $ 190,000,000.0            
AA Biopharma Inc. | GB001                      
Business Acquisition [Line Items]                      
In process research and development       $ 19,300,000              
AA Biopharma Inc. | GB001 | Common stock                      
Business Acquisition [Line Items]                      
Business acquisition, aggregate number of shares issued       1,101,278              
AA Biopharma Inc. | GB001 | Series Seed convertible preferred stock                      
Business Acquisition [Line Items]                      
Business acquisition, aggregate number of shares issued       20,000,000              
Aerpio Pharmaceuticals, Inc. | License Agreement | GB004                      
Business Acquisition [Line Items]                      
Upfront payment $ 15,000,000.0                    
Milestones accrued                 0    
Upfront payment, purchase consideration paid     $ 20,000,000.0                
Participation right (in percentage)     20.00%                
Aerpio Pharmaceuticals, Inc. | License Agreement | GB004 | Maximum                      
Business Acquisition [Line Items]                      
Development and regulatory milestone payments, payable 40,000,000.0                    
Sales milestone payments, payable $ 50,000,000.0                    
Adhaere Pharmaceuticals, Inc. | GB1275                      
Business Acquisition [Line Items]                      
Milestones accrued                 $ 0    
In process research and development             $ 7,500,000        
Upfront payment, purchase consideration paid   $ 7,500,000                  
Milestones payment           $ 1,000,000.0          
Adhaere Pharmaceuticals, Inc. | GB1275 | Maximum                      
Business Acquisition [Line Items]                      
Regulatory, development and sales milestone payments payable   $ 62,000,000.0