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Common Stock - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 1 Months Ended
Jul. 31, 2014
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Series A Warrants [Member]
Jul. 31, 2014
Outstanding Warrants [Member]
Nov. 30, 2008
Outstanding Warrants [Member]
Jul. 31, 2014
Common Stock [Member]
Sep. 30, 2014
Common Stock [Member]
Subsidiary, Sale of Stock [Line Items]                  
Number of shares of common stock and warrants 11,299,435                
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   $ 462,000 $ 1,974,931 $ 460,097