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Capital Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Oct. 31, 2018
Jan. 31, 2018
Sep. 30, 2016
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Class of Stock [Line Items]            
Minimum percentage of outstanding common stock       50.00%    
Fair value of warrants       $ 8,400    
Proceeds from Warrant Exercises       $ 326    
Proceeds from issuance of common stock         $ 5,732  
Convertible preferred stock, shares outstanding       400   400
Preferred stock par value       $ 0.01   $ 0.01
Common Stock [Member]            
Class of Stock [Line Items]            
Number of shares issued   2,691,494     2,691,494  
Common stock price per share   $ 2.35        
Proceeds from issuance of common stock   $ 5,700        
Private Placement [Member]            
Class of Stock [Line Items]            
Class of Warrants or right to purchase common stock     13,333,334      
Common stock price per share     $ 2.25      
Class of Warrants or right to purchase common stock, exercise price     $ 2.25      
Minimum percentage of outstanding common stock       50.00%    
Fair value of warrants       $ 30,700    
Gross proceeds from issuance of common stock, preferred stock and warrants     $ 30,000      
Proceeds from issuance of common stock, preferred stock and warrants, net of issuance costs     $ 27,600      
Conversion of preferred stock in to common stock, preferred stock converted     10,737,275 444.44    
Warrants granted to placement agent     133,333      
Warrants granted to placement agent,exercise price     $ 2.25      
Warrants expiry period       5 years    
Warrants exercisable period       6 months    
Preferred stock par value       $ 0.01    
Private Placement [Member] | Series A Preferred Stock [Member]            
Class of Stock [Line Items]            
Number of shares issued     24,158.8693      
Convertible preferred stock, shares outstanding       400.4910    
Private Placement [Member] | Common Stock [Member]            
Class of Stock [Line Items]            
Number of shares issued     2,596,059      
Private Placement [Member] | Common Stock [Member] | Series A Preferred Stock [Member]            
Class of Stock [Line Items]            
Conversion of preferred stock in to common stock, preferred stock converted       177,996    
The Equity Distribution Agreement [Member] | Common Stock [Member]            
Class of Stock [Line Items]            
Number of shares issued       0 0  
Underwritten Public Offering [Member]            
Class of Stock [Line Items]            
Class of Warrants or right to purchase common stock 19,616,250          
Gross proceeds from offering, before deducting underwriting discounts and commissions and offering expenses $ 17,000          
Class of Warrants or right to purchase common stock, exercise price $ 0.70          
Warrants exercisable term 5 years          
Underwritten Public Offering [Member] | Common Stock And Warrants [Member]            
Class of Stock [Line Items]            
Common stock price per share $ 0.65          
Underwritten Public Offering [Member] | Common Stock [Member]            
Class of Stock [Line Items]            
Number of shares issued 26,155,000          
Maximum [Member] | The Equity Distribution Agreement [Member] | Common Stock [Member]            
Class of Stock [Line Items]            
Aggregate offering price of shares         $ 10,000  
Members of Board of Directors [Member] | Private Placement [Member]            
Class of Stock [Line Items]            
Class of Warrants or right to purchase common stock       1,422,221    
Class of Warrants or right to purchase common stock, exercise price       $ 2.25    
Members of Board of Directors [Member] | Private Placement [Member] | Series A Preferred Stock [Member]            
Class of Stock [Line Items]            
Number of shares issued       2,563.1439    
Members of Board of Directors [Member] | Private Placement [Member] | Common Stock [Member]            
Class of Stock [Line Items]            
Number of shares issued       283,046    
Two Thousand Eighteen Warrants [Member]            
Class of Stock [Line Items]            
Class of Warrants or right to purchase common stock, exercise price       $ 0.70    
Warrant reduced exercise price       $ 0.01    
Proceeds from Warrant Exercises       $ 200    
Two Thousand Sixteen Warrants [Member]            
Class of Stock [Line Items]            
Class of Warrants or right to purchase common stock       508,714    
Class of Warrants or right to purchase common stock, exercise price       $ 2.25    
Warrant reduced exercise price       $ 0.01    
Proceeds from Warrant Exercises       $ 100