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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) | 0 Months Ended |  |  |  |  |  | 0 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 07, 2014 | Jun. 30, 2014 | Apr. 18, 2014 | Dec. 31, 2013 | Mar. 29, 2013 | Mar. 29, 2013 Warrant 1-1 and 1-5 [Member] | Mar. 29, 2013 Warrant 1-6 [Member] | Apr. 18, 2014 Warrant [Member] | May 07, 2014 Black Scholes Model [Member] | Apr. 18, 2014 Black Scholes Model [Member] | Jun. 30, 2014 Black Scholes Model [Member]
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued |  |  |  |  |  |  |  | 1,141,000 |  |  |
Common stock, shares issued |  | 97,050,674 | 1,192,500 | 95,814,565 |  |  |  |  |  |  |
Fair value assumption, expected volatility |  |  |  |  |  |  |  |  | 97.60% | 99.30% | 66.00%
Fair value assumption, risk free interest rate |  |  |  |  |  |  |  |  | 0.90% | 0.20% | 1.00%
Fair value assumption, expected term |  |  |  |  |  |  |  |  | 3 years | 1 year 6 months | 5 years
Fair value assumption, expected dividend yield |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%
Grant date fair value of the initial warrant valuation | $ 1.61 | $ 2.56 | $ 0.99 |  |  |  |  |  |  |  |
Issue of warrants for services | 200,000 |  |  |  |  |  |  |  |  |  |
Closing market price of common stock |  |  |  |  | $ 3.00 |  |  |  |  |  |
Number of shares, exercisable right | 100,000 | 1,441,000 |  |  | 6,905,576 |  | 500,000 |  |  |  |
Exercise price of warrants |  |  |  |  | 0.37 |  |  |  |  |  |
Warrant outstanding, number value |  |  |  |  |  | $ 20,233,338 |  |  |  |  |
Warrant converted, number value |  |  |  |  |  |  | $ 1,465,000 |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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