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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Mar. 31, 2014
Segment
Dec. 31, 2013
Mar. 31, 2014
Outstanding warrants [Member]
Dec. 31, 2012
December 2011 Financing [Member]
Common Stock [Member]
Mar. 31, 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]
Mar. 31, 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]
Mar. 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]
Mar. 31, 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         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
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       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     $ 5,868,000                            
Impairment of goodwill 0                                
Value of patent 0                                
Accumulated other comprehensive income $ 265,561 $ 252,101