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Stockholders' Equity - Summary of Warrants Issued and Outstanding (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 24, 2014
May. 28, 2014
May. 07, 2014
Class Of Warrant Or Right [Line Items]          
Exercise Price     $ 2.50 $ 4.31 $ 2.65
Shares of Common Stock 11,791,000        
Exercisable Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Shares of Common Stock 11,791,000 11,241,000      
Exercisable Warrants [Member] | Warrants One [Member]          
Class Of Warrant Or Right [Line Items]          
Date of Issuance Apr. 18, 2014        
Date of Expiration Apr. 01, 2017        
Exercise Price $ 2.00        
Shares of Common Stock 1,441,000        
Exercisable Warrants [Member] | Warrant Two [Member]          
Class Of Warrant Or Right [Line Items]          
Date of Issuance May 07, 2014        
Date of Expiration May 07, 2017        
Exercise Price $ 2.65        
Shares of Common Stock 200,000        
Exercisable Warrants [Member] | Warrants Three [Member]          
Class Of Warrant Or Right [Line Items]          
Date of Issuance May 28, 2014        
Date of Expiration Oct. 31, 2016        
Exercise Price $ 4.31        
Shares of Common Stock 450,000        
Exercisable Warrants [Member] | Warrants Four [Member]          
Class Of Warrant Or Right [Line Items]          
Date of Issuance Sep. 24, 2014        
Date of Expiration Sep. 24, 2019        
Exercise Price $ 2.50        
Shares of Common Stock 9,000,000        
Exercisable Warrants [Member] | Warrant Five [Member]          
Class Of Warrant Or Right [Line Items]          
Date of Issuance Oct. 20, 2014        
Date of Expiration Oct. 20, 2019        
Exercise Price $ 2.50        
Shares of Common Stock 700,000        
Contingent Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Shares of Common Stock 0 1,750,000      
Less warrants cancelled (1,200,000)        
Contingent Warrants [Member] | Warrant Six [Member]          
Class Of Warrant Or Right [Line Items]          
Date of Issuance May 28, 2014        
Date of Expiration Oct. 31, 2018        
Exercise Price $ 4.31        
Shares of Common Stock 1,200,000