Quarterly report pursuant to Section 13 or 15(d)

Capital Structure - Additional Information (Detail)

v3.22.1
Capital Structure - Additional Information (Detail)
3 Months Ended 12 Months Ended
Mar. 22, 2021
USD ($)
$ / shares
shares
May 27, 2020
USD ($)
$ / shares
shares
Jul. 27, 2016
USD ($)
Mar. 31, 2022
USD ($)
shares
Mar. 31, 2021
shares
Dec. 31, 2020
Jul. 25, 2017
USD ($)
Class of Stock [Line Items]              
Common stock, shares authorized | shares       125,000,000      
Number of shares issued | shares   11,797,752          
Net proceeds received   $ 48,900,000          
Gross Proceed   $ 3,000,000.0          
Dividends declared or paid       $ 0      
Common stock, voting rights       The holders of shares of common stock are entitled to one vote for each share of common stock held at all meetings of stockholders and written actions in lieu of meetings.      
Issuance of common stock for exercise of warrants, Shares | shares         22,560    
Private Placement [Member]              
Class of Stock [Line Items]              
Public offering price, per unit | $ / shares   $ 4.45          
Issuance of securities in private placement, Shares | shares   674,156          
Follow-on Offering [Member]              
Class of Stock [Line Items]              
Public offering price, per unit | $ / shares   $ 4.45          
Warrants to purchase shares of common stock | shares   8,848,314          
Warrant exercise price per share | $ / shares   $ 4.90          
Conversion ratio of common stock       0.75   0.75  
Follow-on Offering [Member] | 2017 Warrants [Member]              
Class of Stock [Line Items]              
Fair value of warrants             $ 12,400,000
Issuance costs allocated to warrants     $ 900,000        
Follow-on Offering [Member] | 2020 Warrants [Member]              
Class of Stock [Line Items]              
Fair value of warrants   $ 31,400,000          
Issuance costs allocated to warrants   $ 2,200,000          
Over-Allotment Option [Member]              
Class of Stock [Line Items]              
Number of shares issued | shares 11,500,000            
Public offering price, per unit | $ / shares $ 5.00            
Exercise price per common share | $ / shares $ 5.00            
Proceeds from Issuance Initial Public Offering $ 53,800,000            
Pfizer Warrants [Member]              
Class of Stock [Line Items]              
Warrants to purchase shares of common stock | shares   505,617          
Warrant exercise price per share | $ / shares   $ 4.90