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Warrant Liability - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2008
Outstanding warrants [Member]
Dec. 31, 2013
Series A Warrants [Member]
Dec. 31, 2012
Series A Warrants [Member]
Mar. 31, 2014
Series A Warrants [Member]
Nov. 30, 2008
November 2008 Financing [Member]
Mar. 31, 2014
November 2008 Financing [Member]
Nov. 30, 2008
November 2008 Financing [Member]
Common Stock [Member]
Nov. 30, 2009
November 2009 Financing [Member]
Mar. 31, 2014
November 2009 Financing [Member]
Nov. 30, 2009
November 2009 Financing [Member]
Common Stock [Member]
Dec. 31, 2011
December 2011 Financing [Member]
Mar. 31, 2014
December 2011 Financing [Member]
Series A Warrants [Member]
Dec. 31, 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]
Mar. 31, 2014
December 2011 Financing [Member]
Series B Warrant [Member]
Dec. 31, 2012
December 2011 Financing [Member]
Series B Warrant [Member]
Dec. 31, 2011
December 2011 Financing [Member]
Series B Warrant [Member]
Dec. 31, 2013
December 2011 Financing [Member]
Common Stock [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]
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   $ 538,000 $ 3,078,000   $ 18,637,000     $ 11,985,000                                
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 Series A warrants in each unit issued in public offering                     1                          
Number of warrants exercised                         384,534 2,198,571     2,700,000              
Number of shares issued upon warrants exercise                                       2,700,000        
Number of shares issued upon warrants exercise                           2,700,000         384,534 2,198,571        
Number of warrants expired                               5,300,000