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Stockholders' Equity - Additional Information (Detail) (USD $) | 0 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 07, 2014 | Apr. 18, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Oct. 28, 2013 | Mar. 29, 2013 | Oct. 31, 2012 Maximum [Member]
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  | 10,000,000 |  | 10,000,000 |  |  |
Preferred stock, par value |  |  | $ 0.001 |  | $ 0.001 |  |  |
Preferred stock, shares issued |  |  | 0 |  | 0 |  |  |
Preferred stock, shares outstanding |  |  | 0 |  | 0 |  |  |
Common stock, shares authorized |  |  | 200,000,000 |  | 200,000,000 | 200,000,000 |  |
Common stock, par value |  |  | $ 0.001 |  | $ 0.001 |  | $ 3.00 |
Common stock, shares issued |  | 1,192,500 | 97,050,674 |  | 95,814,565 |  |  |
Common stock, shares outstanding |  |  | 97,050,674 |  | 95,814,565 |  |  |
Common stock issued for services, Shares |  |  | 20,408 | 17,226 |  |  |  |
Common stock issued for services, Value |  |  | $ 50,000 | $ 50,780 |  |  |  |
Common stock issued for services, Expense |  |  | 33,333 |  |  |  |  |
Common stock issued for services, Prepaid expense |  |  | 16,667 |  |  |  |  |
Warrant conversions, shares |  | 1,192,500 | 1,192,500 |  |  |  |  |
Warrant conversions, amount |  | 2,385,000 | 2,385,000 |  |  |  |  |
Warrant to purchase common stock, per share | $ 2.65 | $ 2.00 | $ 2.00 |  |  |  |  |
Additional warrants issued |  |  | 248,500 |  |  |  |  |
Number of shares, exercisable right | 100,000 |  | 1,441,000 |  |  |  | 6,905,576 |
Number of shares available for grant |  |  |  |  |  |  |  | 7,500,000
Stock-based compensation |  |  | 359,456 | 1,573,010 |  |  |  |
Options outstanding, intrinsic value |  |  | 12,331,935 |  |  |  |  |
Options exercisable, intrinsic value |  |  | 8,699,835 |  |  |  |  |
Unvested share-based awards |  |  | $ 2,019,103 |  |  |  |  |

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