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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
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