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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
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