v3.19.3
Capital Stock - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jan. 09, 2019
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Jan. 31, 2018
Subsidiary Sale Of Stock [Line Items]                
Warrants exercisable into shares of common stock               570,287
Exercise price of warrants, per share               $ 9.15
Loss on extinguishment of debt             $ 9,000  
Aggregate proceeds from exercise of warrants             $ 1,154,000  
Common Stock [Member]                
Subsidiary Sale Of Stock [Line Items]                
Preferred stock convertible into common stock       297,000 220,000 404,000    
Settlement Agreement with Vendor [Member]                
Subsidiary Sale Of Stock [Line Items]                
Amount owed by vendor   $ 164,000            
Issuance of restricted common shares   93,448            
Warrants exercisable into shares of common stock   93,448 382,165          
Exercise price of warrants, per share   $ 1.64            
Warrants exercisable beginning date   Jul. 09, 2019            
Warrants exercisable expiration date   Jan. 09, 2022            
Fair value of warrants estimated on the date of issuance   $ 59,000            
Combined value of the stock and warrants   173,000            
Loss on extinguishment of debt   9,000            
Strike price per share     $ 3.02          
Aggregate proceeds from exercise of warrants     $ 1,154,000          
Settlement Agreement with Vendor [Member] | Restricted Stock Award [Member]                
Subsidiary Sale Of Stock [Line Items]                
Fair value of restricted stock estimated on the date of issuance   $ 114,000,000            
Fair value assumption, discount rate   25.00%            
Fair value assumption, risk-free interest rates   2.52%            
Fair value assumption,expected term   6 months            
Fair value assumption, expected volatility   90.00%            
Settlement Agreement with Vendor [Member] | Warrants [Member]                
Subsidiary Sale Of Stock [Line Items]                
Fair value assumption, risk-free interest rates   2.54%            
Fair value assumption,expected term   3 years            
Fair value assumption, expected volatility   90.00%            
Settlement Agreement with Vendor [Member] | Common Stock [Member]                
Subsidiary Sale Of Stock [Line Items]                
Preferred stock convertible into common stock 297,000