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Stockholders' Equity - Summary of Warrants Issued and Outstanding (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
Class of Warrant or Right [Line Items]  
Shares of Common Stock 3,291,000
Exercisable Warrants [Member]
  
Class of Warrant or Right [Line Items]  
Shares of Common Stock 1,541,000
Exercisable Warrants [Member] | Warrants 10 - 24 [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 25 [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 100,000
Contingent Warrants [Member]
  
Class of Warrant or Right [Line Items]  
Shares of Common Stock 1,750,000
Contingent Warrants [Member] | Warrant 26 [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 100,000
Contingent Warrants [Member] | Warrant 27 [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
Contingent Warrants [Member] | Warrants 28 - 34 [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