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Common Stock - Additional Information (Detail) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 0 Months Ended | 1 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Series A Warrants [Member] | Jun. 30, 2014 Series A Warrants [Member] | Dec. 31, 2012 2012 Amended Sales Agreement [Member] | Jun. 30, 2014 2012 Amended Sales Agreement [Member] | Jun. 30, 2014 2012 Amended Sales Agreement [Member] Common Stock [Member] | Jul. 31, 2014 Subsequent Events [Member] | Jul. 31, 2014 Subsequent Events [Member] Series A Warrants [Member] | Jul. 31, 2014 Subsequent Events [Member] Common Stock [Member] | Jun. 30, 2014 2013 Financing [Member] | Jun. 30, 2014 2013 Financing [Member] Common Stock [Member]
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised |  |  | 850,000 | 850,000 |  |  |  |  |  |  | 175,750 |
Number of shares issued upon warrants exercise |  |  |  |  |  |  |  | 11,299,435 |  | 850,000 |  | 175,750
Proceeds from sale of stock |  |  |  |  |  |  |  |  | $ 1,190,000 |  | $ 316,000 |
Percentage of compensation paid to sales agent |  |  |  |  |  | 2.00% |  |  |  |  |  |
Shares available to sale |  |  |  |  | 30,000,000 |  |  |  |  |  |  |
Common stock, sold |  |  |  |  |  |  | 193,271 |  |  |  |  |
Sale of stock, price per share |  |  |  |  |  |  | $ 1.47 |  |  |  |  |
Gross proceeds from common stock | $ 279,084 | $ 4,911,627 |  |  |  | $ 285,000 |  |  |  |  |  |

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