Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Additional Information (Detail)

v3.22.1
Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
Apr. 30, 2015
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2019
Summary Of Significant Accounting Policies [Line Items]        
Revenue   $ 756,793 $ 327,350  
Research and development expense, total   20,572,580 17,066,122  
Liability for unrecognized tax benefits   0    
Interest or penalties for uncertain tax positions   $ 0 $ 0  
Antidilutive securities excluded from computation of earnings per share, amount   5,519,068 5,256,942  
Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1       $ 10.00
Warrants Issued to Private Investors [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount   3,284,789 3,284,789  
Warrants Issued to Private Investors [Member] | Expiring at October 6 2022        
Summary Of Significant Accounting Policies [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount   1,618,123    
Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1   $ 23.00    
Warrants Issued to Private Investors [Member] | Expiring at March 1 2024        
Summary Of Significant Accounting Policies [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount   1,666,666    
Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1   $ 10.00    
Employee Stock Purchase Plan [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Common stock purchase price discount percentage 85.00% 15.00%    
Product Development Projects Revenue [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenue   $ 756,793 $ 197,350  
Contract Services Revenue [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenue   $ 0 $ 130,000