Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.20.4
Subsequent Events - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Aug. 16, 2019
Subsequent Event [Line Items]            
Warrants exercised for cash       $ 1,180,000 $ 27,000  
Accumulated stock option exercises       35,000    
Stock options exercised for cash       $ 21,000    
Stock options [Member]            
Subsequent Event [Line Items]            
Accumulated stock option exercises       35    
Stock option exercise price       $ 0.61    
Common stock            
Subsequent Event [Line Items]            
Warrants exercise price           $ 0.001
Exercise of warrants for cash, shares   186,000 993,000      
Conversion of Series C preferred stock to common stock, shares   1,168,000        
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Warrants issued 2,276,814          
Warrants exercise price $ 1.00          
Warrants exercised for cash $ 2,276,814          
Exercise of warrants for cash, shares 471,283          
Number of common shares called by warrants exercise 257,979          
Class of warrants or rights issued during period 100,000          
Warrants exercise price $ 1.47          
Class of warrants or rights issued during period 12,500          
Warrants exercise price expired $ 30.00          
Subsequent Event [Member] | Stock options [Member]            
Subsequent Event [Line Items]            
Accumulated stock option exercises 33,750          
Stock option exercise price $ 0.61          
Stock options exercised for cash $ 20,588,000          
Subsequent Event [Member] | Series C-1 Preferred Shares [Member]            
Subsequent Event [Line Items]            
Conversion of Series C preferred stock to common stock, shares 1,515          
Subsequent Event [Member] | Series C-1 Preferred Shares [Member] | Common stock            
Subsequent Event [Line Items]            
Conversion of Series C preferred stock to common stock, shares 1,306,041          
Subsequent Event [Member] | Series C-2 Preferred Shares [Member]            
Subsequent Event [Line Items]            
Conversion of Series C preferred stock to common stock, shares 912          
Subsequent Event [Member] | Series C-2 Preferred Shares [Member] | Common stock            
Subsequent Event [Line Items]            
Conversion of Series C preferred stock to common stock, shares 751,239          
Subsequent Event [Member] | Series C-3 Preferred Shares [Member]            
Subsequent Event [Line Items]            
Conversion of Series C preferred stock to common stock, shares 150          
Subsequent Event [Member] | Series C-3 Preferred Shares [Member] | Common stock            
Subsequent Event [Line Items]            
Conversion of Series C preferred stock to common stock, shares 130,436          
Subsequent Event [Member] | Series B Preferred Shares [Member]            
Subsequent Event [Line Items]            
Conversion of preferred stock to common stock, share 6,250          
Subsequent Event [Member] | Series B Preferred Shares [Member] | Common stock            
Subsequent Event [Line Items]            
Conversion of preferred stock to common stock, share 1,563