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Common Stock - Additional Information (Detail) (USD $)
9 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 42 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
Series A Warrants [Member]
Jun. 30, 2013
Institutional Investors [Member]
Jun. 30, 2013
Common Stock [Member]
Institutional Investors [Member]
Jun. 30, 2009
2009 Sales Agreement [Member]
Nov. 30, 2012
2009 Sales Agreement [Member]
Mar. 31, 2013
December 2011 Financing [Member]
Series A Warrants [Member]
Dec. 31, 2011
December 2011 Financing [Member]
Series A Warrants [Member]
Mar. 31, 2013
December 2011 Financing [Member]
Common Stock [Member]
Dec. 31, 2012
December 2011 Financing [Member]
Common Stock [Member]
Dec. 31, 2012
2012 Amended Sales Agreement [Member]
Sep. 30, 2013
2012 Amended Sales Agreement [Member]
Sep. 30, 2013
2012 Amended Sales Agreement [Member]
Common Stock [Member]
Subsidiary, Sale of Stock [Line Items]                            
Shares available to sale       $ 30,000,000   $ 30,000,000           $ 30,000,000    
Gross proceeds from common stock 6,115,442 16,196,587   3,000,000     26,700,000           3,317,000  
Percentage of compensation paid to sales agent                         3.00%  
Common stock, sold         1,645,639                 1,733,771
Sale of stock, price per share         $ 1.823                 $ 1.91
Number of warrants exercised               334,534            
Number of shares issued upon warrants exercise         329,131         334,534 2,700,000      
Proceeds from sale of stock     468,000         468,000 468,000          
Exercise period of rights       3 years                    
Additional amounts of common stock to sell       $ 27,000,000                    
Warrants termination agreement 2013-10