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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