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Stockholders' Equity - Common Stock Warrants (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Class of Warrant or Right [Line Items]    
Shares issued upon net exercise of outstanding warrants 536,564  
Number of warrants exercised 546,709  
Shares issued upon cash exercise of warrants 7,159  
Warrants Exercised Weighted Average Exercise Price $ 0.33  
Proceeds from cash exercise of warrants $ 2,336  
Common stock warrants outstanding 0  
Warrants expiring July 18, 2018    
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
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
Exercise price per share $ 0.33