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Subsequent Events - Additional Information (Detail) (USD $) | 6 Months Ended | 1 Months Ended | 0 Months Ended |  | 0 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Nov. 30, 2008 Outstanding Warrants [Member] | Jul. 31, 2014 Subsequent Events [Member] | Jul. 31, 2014 Subsequent Events [Member] | Jul. 31, 2014 Subsequent Events [Member] Outstanding Warrants [Member] | Jul. 31, 2014 Subsequent Events [Member] Series A Warrants [Member] | Jul. 31, 2014 Subsequent Events [Member] Common Stock [Member] | Jul. 31, 2014 Subsequent Events [Member] Common Stock [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of shares of common stock and warrants |  |  |  | 11,299,435 |  |  |  |  | 850,000
Sale of common stock and warrant, price per share |  |  |  | $ 1.77 |  |  |  |  |
Proceeds from issuance of common stock and warrants |  |  |  | $ 20,000,000 |  |  |  |  |
Number of shares of common stock or warrant in each unit sold to institutional investors |  |  | 1 |  |  | 1 |  | 1 |
Number of securities callable by each warrant or right warrants |  |  |  |  |  |  |  |  | 0.85
Warrant exercise price |  |  |  |  | 2.17 |  |  |  |
Warrant expiration period |  |  |  | 13 months |  |  |  |  |
Number of shares exercise |  |  |  |  |  |  | 330,015 |  |
Numbers of share issued |  |  |  |  |  |  |  |  | 330,015
Proceeds from the exercise of warrants | $ 316,350 | $ 460,762 |  | $ 462,000 |  |  |  |  |

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