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Warrant Liability - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
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Nov. 30, 2008 Warrant liabilities [Member] | Mar. 31, 2013 Series A Warrants [Member] | Sep. 30, 2013 Series A Warrants [Member] | Nov. 30, 2008 November 2008 Financing [Member] | Sep. 30, 2013 November 2008 Financing [Member] | Nov. 30, 2008 November 2008 Financing [Member] Common Stock [Member] | Nov. 30, 2009 November 2009 Financing [Member] | Sep. 30, 2013 November 2009 Financing [Member] | Nov. 30, 2009 November 2009 Financing [Member] Common Stock [Member] | Dec. 31, 2011 December 2011 Financing [Member] | Mar. 31, 2013 December 2011 Financing [Member] Series A Warrants [Member] | Sep. 30, 2013 December 2011 Financing [Member] Series A Warrants [Member] | Dec. 31, 2012 December 2011 Financing [Member] Series A Warrants [Member] | Dec. 31, 2011 December 2011 Financing [Member] Series A Warrants [Member] | Dec. 31, 2012 December 2011 Financing [Member] Series B Warrant [Member] | Dec. 31, 2011 December 2011 Financing [Member] Series B Warrant [Member] | Mar. 31, 2013 December 2011 Financing [Member] Common Stock [Member] | Sep. 30, 2013 December 2011 Financing [Member] Common Stock [Member] | Dec. 31, 2012 December 2011 Financing [Member] Common Stock [Member] | Dec. 31, 2011 December 2011 Financing [Member] Common Stock [Member] Series A Warrants [Member] | Dec. 31, 2011 December 2011 Financing [Member] Capital Units [Member] Series A Warrants [Member] | Dec. 31, 2011 December 2011 Financing [Member] Capital Units [Member] Series B Warrant [Member]
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units sold to investors |  |  |  | 1,379,310 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per unit |  |  |  | $ 14.50 |  |  | $ 12.50 |  |  | $ 1.25 |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from units sold to investors |  |  |  | $ 20,000,000 |  |  | $ 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities callable by each warrant or right warrants |  |  |  |  |  | 0.75 |  |  | 0.40 |  |  |  |  |  |  |  |  | 1 |  |  | 1 | 1
Exercise price of warrants |  |  | 1.40 |  | 23.00 | 23.00 |  | 15.00 | 15.00 |  |  |  |  |  |  |  |  |  |  | 1.40 |  |
Proceeds from sale of stock |  | $ 468,000 |  | $ 18,637,000 |  |  | $ 11,985,000 |  |  |  | $ 468,000 |  |  | $ 468,000 |  |  |  |  |  |  |  |
Number of shares of common stock in each unit sold to institutional investors | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities callable by warrants |  |  |  |  |  | 1,034,483 |  |  | 400,000 |  |  |  |  | 8,000,000 |  | 8,000,000 |  |  |  |  |  |
Number of units sold to investors |  |  |  |  |  |  | 1,000,000 |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants in each unit sold to institutional investors |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Term of warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |
Warrant expiration |  |  |  |  |  |  |  |  |  |  |  | December 2016 |  | 2012-May-02 |  |  |  |  |  |  |  |
Number of warrants exercised |  |  |  |  |  |  |  |  |  |  | 334,534 | 2,198,571 |  |  | 2,700,000 |  |  |  |  |  |  |
Number of shares issued upon warrants exercise |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 334,534 | 2,198,571 | 2,700,000 |  |  |
Number of warrants issued |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |  |
Number of warrants expired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,300,000 |  |  |  |  |  |  |
Number of Series A warrants in each unit issued in public offering |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |

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