Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Additional Information (Detail)

v3.22.2.2
Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Apr. 30, 2015
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2019
Summary Of Significant Accounting Policies [Line Items]            
Revenue   $ 232,971 $ 184,960 $ 448,932 $ 330,025  
Research and development expense, total   3,209,910 6,103,694 6,737,056 10,694,938  
Liability for unrecognized tax benefits   0   0    
Interest or penalties for uncertain tax positions   $ 0 $ 0 $ 0 $ 0  
Antidilutive securities excluded from computation of earnings per share, amount   6,212,707 6,323,445 6,212,707 6,323,445  
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 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 3,284,789 3,284,789  
Warrants Issued to Private Investors [Member] | Expiring on 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 Rights   $ 23.00   $ 23.00    
Warrants Issued to Private Investors [Member] | Expiring on 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 Rights   $ 10.00   $ 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   $ 232,971 $ 184,960 $ 448,932 $ 330,025