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Warrants - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Sep. 26, 2016
Sep. 25, 2016
Jun. 15, 2016
Apr. 14, 2016
Dec. 31, 2015
Class Of Warrant Or Right [Line Items]            
Estimated fair value of warrants       $ 1,700    
Warrants issued       1,002,507    
Common stock warrant liability $ 5,208         $ 0
Estimated fair value of warrant liability remeasurement charge $ 300          
Private Placement [Member]            
Class Of Warrant Or Right [Line Items]            
Estimated fair value of warrants         $ 3,300  
Warrants issued   1,775,580     1,975,580  
Exercise Price   $ 4.00 $ 4.98      
Private Placement [Member] | Accredited Investors [Member]            
Class Of Warrant Or Right [Line Items]            
Estimated fair value of warrants         $ 3,000  
Warrants issued         1,775,580  
Private Placement [Member] | Placement Agents [Member]            
Class Of Warrant Or Right [Line Items]            
Estimated fair value of warrants         $ 300  
Warrants issued         200,000  
Subsequent Financing [Member]            
Class Of Warrant Or Right [Line Items]            
Warrants issued   1,002,507        
Exercise Price   $ 4.00 $ 4.98      
Private Placement and Subsequent Financing [Member]            
Class Of Warrant Or Right [Line Items]            
Common stock warrant liability         $ 5,000