Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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9 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | ||||||||||||
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Sep. 30, 2013
Segment
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Jun. 30, 2013
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Dec. 31, 2012
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Sep. 30, 2013
Warrant liabilities [Member]
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Mar. 31, 2013
December 2011 Financing [Member]
Common Stock [Member]
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Dec. 31, 2012
December 2011 Financing [Member]
Common Stock [Member]
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Sep. 30, 2013
December 2011 Financing [Member]
Common Stock [Member]
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Dec. 31, 2011
December 2011 Financing [Member]
Series A Warrants [Member]
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Dec. 31, 2012
December 2011 Financing [Member]
Series A Warrants [Member]
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Sep. 30, 2013
December 2011 Financing [Member]
Series A Warrants [Member]
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Dec. 31, 2011
December 2011 Financing [Member]
Series A Warrants [Member]
Common Stock [Member]
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Dec. 31, 2011
December 2011 Financing [Member]
Series B Warrants [Member]
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Dec. 31, 2012
December 2011 Financing [Member]
Series B Warrants [Member]
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Sep. 30, 2013
November 2008 Financing [Member]
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Sep. 30, 2013
November 2008 Financing [Member]
Warrant liabilities [Member]
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Nov. 30, 2008
November 2008 Financing [Member]
Common Stock [Member]
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Nov. 30, 2008
November 2008 Financing [Member]
Warrant liabilities [Member]
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Sep. 30, 2013
November 2009 Financing [Member]
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Sep. 30, 2013
November 2009 Financing [Member]
Warrant liabilities [Member]
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Nov. 30, 2009
November 2009 Financing [Member]
Common Stock [Member]
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Nov. 30, 2009
November 2009 Financing [Member]
Warrant liabilities [Member]
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Class of Warrant or Right [Line Items] | |||||||||||||||||||||
Number of segments | 1 | ||||||||||||||||||||
Maturity period for market accounts, money market funds and investments | 90 days | ||||||||||||||||||||
Warrant component | 1 | 1 | 0.75 | 0.40 | |||||||||||||||||
Number of securities callable by warrants | 8,000,000 | 8,000,000 | 1,034,483 | 400,000 | |||||||||||||||||
Exercise price of warrants | 1.40 | 1.25 | 23.00 | 23.00 | 15.00 | 15.00 | |||||||||||||||
Term of warrant | 5 years | 90 days | 5 years | 5 years | |||||||||||||||||
Number of warrants exercised | 2,700,000 | ||||||||||||||||||||
Number of shares issued upon Series B warrants exercise | 334,534 | 2,700,000 | |||||||||||||||||||
Number of warrants issued upon Series B warrants exercise | 2,700,000 | ||||||||||||||||||||
Number of warrants expired | 5,300,000 | ||||||||||||||||||||
Fair value of derivative liability | $ 8,420,954 | $ 15,260 | |||||||||||||||||||
Impairment of goodwill | 0 | ||||||||||||||||||||
Value of patent | 0 | ||||||||||||||||||||
Accumulated other comprehensive income | $ 170,605 | $ (35,090) | $ 193,177 |