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Capital Stock - Series G Preferred Stock - Additional Information (Detail) (USD $)
9 Months Ended 12 Months Ended 145 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2007
Sep. 30, 2013
Mar. 09, 2012
Series G Preferred Stock [Member]
Sep. 30, 2013
Series G Preferred Stock [Member]
Mar. 31, 2013
Series G Preferred Stock [Member]
Sep. 30, 2013
Series G Preferred Stock [Member]
Directors
Dec. 31, 2012
Series G Preferred Stock [Member]
Sep. 30, 2013
Series G Preferred Stock [Member]
Minimum [Member]
Mar. 09, 2012
Series G Preferred Stock [Member]
AR Partners, LLC [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]                        
Number of purchase agreement shares sold                       5,000,000
Selling price per shares                       $ 1.00
Common stock sold for an aggregate to aspire capital       $ 1,200,000               $ 5,000,000
Convertible shares of common stock       $ 1.00     $ 0.40   $ 0.40      
Initial conversion ratio of common stock                 2.50%      
Rate of preferred stock dividend and redemption premium                 6.00%      
Preferred Stock, shares outstanding                     1,000,000  
Number of directors to be nominated by preferred shareholders                 2      
Number of independent directors out of directors to be nominated by preferred shareholders                 1      
Reversal of dividend accreted 93,000 93,000     93,000         93,000    
Legal costs                   59,000    
Total deemed dividend     $ (524,000)     $ 1,375,000            
Common stock issued upon conversion, conversion price per share               $ 0.20        
Convertible Preferred Stock conversion price             $ 0.30 $ 0.37        
Convertible Preferred Stock conversion ratio             3.28 2.67 3.28