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Stockholders' Equity - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Apr. 02, 2019
USD ($)
$ / shares
shares
Mar. 28, 2019
USD ($)
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
$ / shares
Class Of Stock [Line Items]        
Placement agent fees | $     $ 37  
Grant date fair value of the common warrants, per share | $ / shares     $ 1.78 $ 1.78
Grant date fair value of the common warrants | $       $ 23,025
Risk Free Rate [Member]        
Class Of Stock [Line Items]        
Warrants and rights, measurement input     2.23 2.23
Expected Term [Member]        
Class Of Stock [Line Items]        
Warrants and Rights Outstanding, Term     5 years 5 years
Volatility [Member]        
Class Of Stock [Line Items]        
Warrants and rights, measurement input     76 76
Private Placement [Member]        
Class Of Stock [Line Items]        
Aggregate gross proceeds from private placement | $ $ 26,000 $ 26,000    
Placement agent fees | $ $ 2,175 $ 2,175    
Private Placement [Member] | Stock Units [Member] | Purchase Agreement One [Member]        
Class Of Stock [Line Items]        
Issue and sale of aggregate shares 11,838,582      
Sale of stock, combined price per unit | $ / shares $ 2.01      
Private Placement [Member] | Stock Units [Member] | Purchase Agreement Two [Member]        
Class Of Stock [Line Items]        
Issue and sale of aggregate shares 1,096,741      
Sale of stock, combined price per unit | $ / shares $ 2.01      
Private Placement [Member] | Common Warrants [Member] | Purchase Agreement One [Member]        
Class Of Stock [Line Items]        
Aggregate shares purchase for warrants 11,838,582      
Warrants exercisable, exercise price | $ / shares $ 2.00      
Warrants and Rights Outstanding, Term 5 years      
Private Placement [Member] | Common Stock [Member] | Purchase Agreement One [Member]        
Class Of Stock [Line Items]        
Stock repurchase program, number of shares to be purchased 11,838,582      
Private Placement [Member] | Common Stock [Member] | Purchase Agreement Two [Member]        
Class Of Stock [Line Items]        
Stock repurchase program, number of shares to be purchased 1,096,741      
Private Placement [Member] | Pre-funded Warrants [Member] | Purchase Agreement Two [Member]        
Class Of Stock [Line Items]        
Aggregate shares purchase for warrants 1,096,741      
Warrants exercisable, exercise price | $ / shares $ 0.01