Quarterly report pursuant to Section 13 or 15(d)

Stock Warrants - Schedule of Warrants Outstanding (Detail)

v3.22.1
Stock Warrants - Schedule of Warrants Outstanding (Detail) - $ / shares
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
May 27, 2020
Class of Warrant or Right [Line Items]      
Shares Underlying Outstanding Warrants 10,925,166 10,926,594  
Weighted-average exercise price per share $ 6.45 $ 6.47  
Pfizer Warrants [Member]      
Class of Warrant or Right [Line Items]      
Shares Underlying Outstanding Warrants 505,617 505,617  
Exercise Prices     $ 4.90
Other Warrants [Member]      
Class of Warrant or Right [Line Items]      
Shares Underlying Outstanding Warrants [1] 0 1,428  
Exercise Price Four Point Nine Zero [Member]      
Class of Warrant or Right [Line Items]      
Shares Underlying Outstanding Warrants 9,325,521    
Expiration Start Date May 27, 2023    
Exercise Price Fifteen Point Five Zero [Member]      
Class of Warrant or Right [Line Items]      
Shares Underlying Outstanding Warrants 1,599,645    
Expiration Start Date Jul. 25, 2022    
Minimum [Member] | Exercise Price Four Point Nine Zero [Member]      
Class of Warrant or Right [Line Items]      
Exercise Prices $ 4.90    
Minimum [Member] | Exercise Price Fifteen Point Five Zero [Member]      
Class of Warrant or Right [Line Items]      
Exercise Prices $ 15.50    
2017 Warrants [Member]      
Class of Warrant or Right [Line Items]      
Shares Underlying Outstanding Warrants 1,599,645 1,599,645  
2020 Warrants [Member]      
Class of Warrant or Right [Line Items]      
Shares Underlying Outstanding Warrants 8,819,904 8,819,904  
[1] Other warrants are comprised of warrants issued prior to the Company’s initial public offering (“IPO”), generally in exchange for services rendered to the Company.