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Stockholders' Equity - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Feb. 13, 2020
USD ($)
Feature
$ / shares
shares
Jan. 15, 2020
USD ($)
$ / shares
shares
Apr. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
shares
Jul. 23, 2018
USD ($)
Class Of Stock [Line Items]              
Proceeds from issuance of common stock | $         $ 107,000    
Warrant inducement expense | $       $ 4,829,000      
Warrants available for exercise       7,415,591   7,070,680  
Preferred stock, par value | $ / shares       $ 0.001   $ 0.001  
PRSUs [Member]              
Class Of Stock [Line Items]              
Number of shares vested       55,000      
Value of shares vested | $       $ 204,765      
Series A Warrants [Member]              
Class Of Stock [Line Items]              
Warrants available for exercise       0   3,449,112  
Series B Warrants [Member]              
Class Of Stock [Line Items]              
Warrants available for exercise       0   3,449,112  
Series X Preferred Stock [Member]              
Class Of Stock [Line Items]              
Number of embedded features within preferred stock | Feature 2            
Securities Purchase Agreement [Member] | 2019 Equity Offering [Member]              
Class Of Stock [Line Items]              
Common stock shares agreed to sell     3,449,112        
Common stock shares gross proceeds value | $     $ 10,700,000        
Private Placement [Member]              
Class Of Stock [Line Items]              
Warrants available for exercise       6,898,224   0  
Private Placement [Member] | Series A Warrants [Member] | 2019 Equity Offering [Member]              
Class Of Stock [Line Items]              
Warrant exercise price per share | $ / shares     $ 4.00        
Warrants exercisable term     18 months        
Private Placement [Member] | Series B Warrants [Member] | 2019 Equity Offering [Member]              
Class Of Stock [Line Items]              
Warrant exercise price per share | $ / shares     $ 4.00        
Warrants exercisable term     5 years        
Placement Agent [Member]              
Class Of Stock [Line Items]              
Warrants available for exercise       172,456   172,456  
Placement Agent [Member] | 2019 Equity Offering [Member]              
Class Of Stock [Line Items]              
Warrant exercise price per share | $ / shares     $ 3.87        
Percentage of warrants to issue shares of common stock     5.00%        
Percentage of warrant exercise price per share     125.00%        
Warrants offering price maturity date     Apr. 30, 2024        
Common Stock [Member] | Private Placement [Member] | Series A Warrants [Member] | Maximum [Member] | 2019 Equity Offering [Member]              
Class Of Stock [Line Items]              
Warrants to issue shares of common stock     3,449,112        
Common Stock [Member] | Private Placement [Member] | Series B Warrants [Member] | Maximum [Member] | 2019 Equity Offering [Member]              
Class Of Stock [Line Items]              
Warrants to issue shares of common stock     3,449,112        
Common Stock [Member] | Placement Agent [Member] | Maximum [Member] | 2019 Equity Offering [Member]              
Class Of Stock [Line Items]              
Warrants to issue shares of common stock     172,456        
Warrant Exercise Agreements [Member] | Warrants [Member]              
Class Of Stock [Line Items]              
Common stock shares gross proceeds value | $   $ 5,800,000          
Warrants to issue shares of common stock   6,898,224          
Warrant reduced exercise price per share | $ / shares   $ 0.715          
Warrant additional exercise price per share | $ / shares   0.125          
Warrant Exercise Agreements [Member] | Common Stock [Member]              
Class Of Stock [Line Items]              
Warrant exercise price per share | $ / shares   $ 0.72          
Warrants exercisable term   5 years 6 months          
Warrant Exercise Agreements [Member] | Common Stock [Member] | Maximum [Member]              
Class Of Stock [Line Items]              
Warrants to issue shares of common stock   6,898,224          
Warrant Exercise Agreements [Member] | Common Stock [Member] | Placement Agent [Member]              
Class Of Stock [Line Items]              
Warrant exercise price per share | $ / shares   $ 1.05          
Percentage of warrants to issue shares of common stock   5.00%          
Warrant Exercise Agreements [Member] | Common Stock [Member] | Placement Agent [Member] | Maximum [Member]              
Class Of Stock [Line Items]              
Warrants to issue shares of common stock   344,911          
Piper Jaffray & Co. [Member] | Equity Distribution Agreement [Member]              
Class Of Stock [Line Items]              
Equity distribution agreement maximum value of common shares issuable | $       $ 8,700,000     $ 9,800,000
Piper Jaffray & Co. [Member] | Equity Distribution Agreement [Member] | Common Stock [Member]              
Class Of Stock [Line Items]              
Common stock number of shares issued       25,218   25,218  
Proceeds from issuance of common stock | $       $ 110,000   $ 110,000  
Exchanging Stockholders [Member] | Exchange Agreement [Member]              
Class Of Stock [Line Items]              
Reimbursement of expenses | $ $ 25,000            
Conversion of stock blocker provision percentage 9.99%            
Exchanging Stockholders [Member] | Exchange Agreement [Member] | Series X Preferred Stock [Member]              
Class Of Stock [Line Items]              
Conversion of stock, shares issued 3,796            
Number of designated preferred stock shares 10,000            
Preferred stock, par value | $ / shares $ 0.001            
Exchanging Stockholders [Member] | Exchange Agreement [Member] | Common Stock [Member]              
Class Of Stock [Line Items]              
Conversion of stock, shares converted 3,796,000            
Convertible preferred stock, shares issued upon conversion of each share 1,000