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Convertible Loan Notes - Additional Information (Detail) - USD ($)
$ in Millions
2 Months Ended 3 Months Ended 6 Months Ended
Jun. 02, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2020
Apr. 30, 2020
Apr. 21, 2020
Convertible Notes Payable [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Debt Face Amount           $ 10.0
Debt Instrument Interest Rate         8.00%  
Convertible Notes Payable [Member] | Fair Value, Inputs, Level 3 [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Gain loss on change in fair value of convertible notes     $ 0.1 $ 0.1    
Convertible Notes Payable [Member] | Debt Instrument Conversion Price Percentage One [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Debt instrument conversion price as a percentage of share price   90.00% 90.00% 90.00%    
Convertible Notes Payable [Member] | Debt Instrument Conversion Price Percentage One [Member] | Qualified Financing Period One [Member] | Maximum [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Term of qualified financing from the date of agreement for conversion price eligibility   3 months        
Convertible Notes Payable [Member] | Debt Instrument Conversion Price Percentage Two [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Debt instrument conversion price as a percentage of share price   80.00% 80.00% 80.00%    
Convertible Notes Payable [Member] | Debt Instrument Conversion Price Percentage Two [Member] | Qualified Financing Period Two [Member] | Maximum [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Term of qualified financing from the date of agreement for conversion price eligibility   6 months        
Convertible Notes Payable [Member] | Debt Instrument Conversion Price Percentage Two [Member] | Qualified Financing Period Two [Member] | Minimum [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Term of qualified financing from the date of agreement for conversion price eligibility   3 months        
Convertible Notes Payable [Member] | Debt Instrument Conversion Price Percentage Three [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Debt instrument conversion price as a percentage of share price   70.00% 70.00% 70.00%    
Convertible Notes Payable [Member] | Debt Instrument Conversion Price Percentage Three [Member] | Qualified Financing Period Three [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Term of qualified financing from the date of agreement for conversion price eligibility   6 months        
Series C Redeemable Convertible Preferred Stock [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Debt conversion, shares issued       6,295,756    
Series C Redeemable Convertible Preferred Stock [Member] | Convertible Notes Payable [Member]            
Disclosure of Convertible Loan Notes [Line Items]            
Debt Instrument benenficial conversion feature $ 10.1          
Conversion price as a percentage of share price waived 90.00%          
Conversion price as a percentage of share price into which the debt instrument is converted 100.00%