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Stockholders' Equity - Common Stock Warrants (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Class of Warrant or Right [Line Items]    
Number Of Warrants Exercised 23,275 11,908
Warrants Exercised Weighted Average Exercise Price $ 0.33 $ 0.33
Number of warrants expired 1,544 0
Warrants expiring July 18, 2018    
Class of Warrant or Right [Line Items]    
Number of shares underlying outstanding warrants   259,907
Warrants expiring July 18, 2018 | Common Stock    
Class of Warrant or Right [Line Items]    
Number of shares underlying outstanding warrants 236,632  
Exercise price per share $ 0.33  
Warrants expiring January 16, 2019    
Class of Warrant or Right [Line Items]    
Number of shares underlying outstanding warrants   301,986
Warrants expiring January 16, 2019 | Common Stock    
Class of Warrant or Right [Line Items]    
Number of shares underlying outstanding warrants 301,986  
Exercise price per share $ 0.33  
Warrants expiring January 30, 2019    
Class of Warrant or Right [Line Items]    
Number of shares underlying outstanding warrants   15,250
Warrants expiring January 30, 2019 | Common Stock    
Class of Warrant or Right [Line Items]    
Number of shares underlying outstanding warrants 15,250  
Exercise price per share $ 0.33  
Warrants expiring October 13, 2016    
Class of Warrant or Right [Line Items]    
Number of shares underlying outstanding warrants   1,544
Warrants expiring October 13, 2016 | Common Stock    
Class of Warrant or Right [Line Items]    
Exercise price per share $ 25.92