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Stockholders' Equity - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 10, 2020
shares
Feb. 13, 2020
USD ($)
Feature
$ / shares
shares
Jan. 15, 2020
USD ($)
$ / shares
shares
Apr. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2020
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
shares
Jul. 23, 2018
USD ($)
Class Of Stock [Line Items]                  
Proceeds from issuance of common stock | $             $ 9,676,000    
Warrant inducement expense | $           $ 4,829,000      
Warrants available for exercise         7,415,591 7,415,591   7,070,680  
Preferred stock, par value | $ / shares         $ 0.001 $ 0.001   $ 0.001  
Preferred shares outstanding         511 511   0  
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 0   3,449,112  
Series B Warrants [Member]                  
Class Of Stock [Line Items]                  
Warrants available for exercise         0 0   3,449,112  
Series X Preferred Stock [Member]                  
Class Of Stock [Line Items]                  
Conversion of stock, shares converted 3,285                
Number of embedded features within preferred stock | Feature   2              
Preferred shares outstanding         511 511      
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 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   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]                  
Class Of Stock [Line Items]                  
Issuance of common stock in connection with conversion of preferred stock, shares         3,285,000 3,285,000      
Number of shares vested         25,000 25,000      
Common Stock [Member] | Series X Preferred Stock [Member]                  
Class Of Stock [Line Items]                  
Issuance of common stock in connection with conversion of preferred stock, shares 3,285,000                
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 | $                 $ 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