Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.20.2
Stockholders' Equity - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Aug. 18, 2020
Jul. 18, 2020
Mar. 23, 2020
Apr. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Oct. 31, 2018
Oct. 16, 2018
Oct. 15, 2018
Apr. 02, 2018
Class Of Stock [Line Items]                      
Recognized compensation expense of stock options         $ 10,200 $ 10,400          
Remaining unrecognized compensation cost         8,000            
Aggregate intrinsic value of outstanding common stock options         0   $ 0        
Proceeds from warrants exercised   $ 135,000     $ 3,081,480 $ 22,320          
Number of warrants, exercised   150,000     1,377,700 9,300          
Warrants, aggregate intrinsic value outstanding   $ 0                  
Cash received for shares issued       $ 1,000,000              
Common stock, par value         $ 0.001   $ 0.001     $ 0.001  
Warrants issued to purchase of common stock   11,200,000                  
Warrants issued to purchase of common stock average exercise price per share   $ 0.90                  
Net proceeds of the offering $ 8,198,000                    
Registered Public Offering [Member]                      
Class Of Stock [Line Items]                      
Proceeds from warrants exercised   $ 135,000                  
Common stock issued 8,300,000                    
Common stock, par value $ 0.001                    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right 1                    
Warrants issued to purchase of common stock   11,200,000                  
Shares Issued, Price Per Share $ 0.90                    
Over-Allotment Option [Member]                      
Class Of Stock [Line Items]                      
Common stock issued 200,000                    
Share Exchange Agreement                      
Class Of Stock [Line Items]                      
Common stock issued     520,833                
Denominator for conversion of convertible note to restricted common shares     $ 2.40                
Cash received for shares issued     $ 250,000                
Stock Warrants [Member]                      
Class Of Stock [Line Items]                      
Proceeds from warrants exercised         $ 3,081,480            
Number of warrants, exercised         1,377,700            
Warrants, aggregate intrinsic value outstanding         $ 249,000   $ 0        
Warrants issued to purchase of common stock         1,638,000     777,059     40,000
Warrants issued to purchase of common stock average exercise price per share         $ 0.67     $ 0.34 $ 12.50   $ 6.605
Stock Warrants [Member] | Registered Public Offering [Member]                      
Class Of Stock [Line Items]                      
Number of warrants, exercised   150,000                  
Pre-Funded Warrants [Member] | Registered Public Offering [Member]                      
Class Of Stock [Line Items]                      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right 1                    
Warrants issued to purchase of common stock 1,700,000                    
Warrants issued to purchase of common stock average exercise price per share $ 0.01                    
Shares Issued, Price Per Share $ 0.89