Capital Stock - Series G Preferred Stock - Additional Information (Detail) (USD $)
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9 Months Ended | 12 Months Ended | 145 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | ||||
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Sep. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2010
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Dec. 31, 2007
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Sep. 30, 2013
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Mar. 09, 2012
Series G Preferred Stock [Member]
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Sep. 30, 2013
Series G Preferred Stock [Member]
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Mar. 31, 2013
Series G Preferred Stock [Member]
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Sep. 30, 2013
Series G Preferred Stock [Member]
Directors
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Dec. 31, 2012
Series G Preferred Stock [Member]
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Sep. 30, 2013
Series G Preferred Stock [Member]
Minimum [Member]
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Mar. 09, 2012
Series G Preferred Stock [Member]
AR Partners, LLC [Member]
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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 |