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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Jul. 31, 2014
Sep. 30, 2014
Segment
Dec. 31, 2013
Sep. 30, 2014
Common Stock [Member]
Jul. 31, 2014
Common Stock [Member]
Sep. 30, 2014
Outstanding Warrants [Member]
Dec. 31, 2012
December 2011 Financing [Member]
Common Stock [Member]
Sep. 30, 2014
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, 2014
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]
May 31, 2014
November 2008 Financing [Member]
Nov. 30, 2008
November 2008 Financing [Member]
Common Stock [Member]
Nov. 30, 2008
November 2008 Financing [Member]
Outstanding Warrants [Member]
Sep. 30, 2014
November 2009 Financing [Member]
Nov. 30, 2009
November 2009 Financing [Member]
Common Stock [Member]
Nov. 30, 2009
November 2009 Financing [Member]
Outstanding Warrants [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         0.85     1     1         0.75     0.40  
Number of securities callable by warrants       330,015         8,000,000       8,000,000     1,034,483     400,000  
Exercise price of warrants $ 2.17                     $ 1.40 $ 1.25     $ 23.00   $ 15.00 $ 15.00  
Warrants issued                             1,034,483          
Term of warrant                 5 years       90 days       5 years     5 years
Common stock per unit   $ 1                                    
Warrants issued per unit   $ 1                                    
Number of warrants exercised                           2,700,000            
Number of shares issued upon Series B warrants exercise 11,299,435           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 warrant liability           $ 4,012,000                            
Impairment of goodwill   0                                    
Value of patent   0                                    
Accumulated other comprehensive income   $ 179,737 $ 252,101