v3.19.2
Capital Stock - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Jan. 09, 2019
Mar. 31, 2019
Jun. 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  
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%