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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 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 | Jun. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Warrant liabilities [Member] | Mar. 31, 2013 December 2011 Financing [Member] Common Stock [Member] | Dec. 31, 2012 December 2011 Financing [Member] Common Stock [Member] | Sep. 30, 2013 December 2011 Financing [Member] Common Stock [Member] | Dec. 31, 2011 December 2011 Financing [Member] Series A Warrants [Member] | Dec. 31, 2012 December 2011 Financing [Member] Series A Warrants [Member] | Sep. 30, 2013 December 2011 Financing [Member] Series A Warrants [Member] | Dec. 31, 2011 December 2011 Financing [Member] Series A Warrants [Member] Common Stock [Member] | Dec. 31, 2011 December 2011 Financing [Member] Series B Warrants [Member] | Dec. 31, 2012 December 2011 Financing [Member] Series B Warrants [Member] | Sep. 30, 2013 November 2008 Financing [Member] | Sep. 30, 2013 November 2008 Financing [Member] Warrant liabilities [Member] | Nov. 30, 2008 November 2008 Financing [Member] Common Stock [Member] | Nov. 30, 2008 November 2008 Financing [Member] Warrant liabilities [Member] | Sep. 30, 2013 November 2009 Financing [Member] | Sep. 30, 2013 November 2009 Financing [Member] Warrant liabilities [Member] | Nov. 30, 2009 November 2009 Financing [Member] Common Stock [Member] | Nov. 30, 2009 November 2009 Financing [Member] Warrant liabilities [Member]
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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