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Stockholders' Equity - Summary of Warrants Issued and Outstanding (Detail) (USD $) | 6 Months Ended
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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

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