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Significant Agreements and Commitments - Additional Information (Details) - USD ($)
 1 Months Ended 6 Months Ended
Jul. 31, 2020
Apr. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Directors and Officers Liability Insurance | Subsequent Event        
Significant Agreements And Commitments [Line Items]        
Liability for insurance policies for total aggregate premium of including excise tax $ 6,420,000      
Directors and Officers Liability Insurance | General and Administrative Expense        
Significant Agreements And Commitments [Line Items]        
Liability for insurance policies for total aggregate premium of including excise tax       $ 6,420,000
Directors and Officers Liability Insurance | Accrued Expenses And Other Current Liabilities        
Significant Agreements And Commitments [Line Items]        
Liability for insurance policies for recognized       $ 270,000
Directors and Officers Liability Insurance | Prepaid Expenses and Other Current Assets | Subsequent Event        
Significant Agreements And Commitments [Line Items]        
Liability for insurance policies for recognized $ 6,150,000      
MDACC | Preclinical Studies and Clinical Trials        
Significant Agreements And Commitments [Line Items]        
Contractual obligation     $ 10,000,000  
Contractual obligation period     5 years  
Contractual obligation paid   $ 2,000,000