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Warrant Liability - Additional Information (Detail) (USD $)
 1 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2008
Nov. 30, 2008
Outstanding Warrants [Member]
Jun. 30, 2014
Series A Warrants [Member]
Dec. 31, 2013
Series A Warrants [Member]
Dec. 31, 2012
Series A Warrants [Member]
Nov. 30, 2008
November 2008 Financing [Member]
Nov. 30, 2008
November 2008 Financing [Member]
Common Stock [Member]
Nov. 30, 2009
November 2009 Financing [Member]
Jun. 30, 2014
November 2009 Financing [Member]
Nov. 30, 2009
November 2009 Financing [Member]
Common Stock [Member]
Dec. 31, 2011
December 2011 Financing [Member]
Jun. 30, 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]
Jun. 30, 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]
Jun. 30, 2014
December 2011 Financing [Member]
Common Stock [Member]
Dec. 31, 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   15.00 15.00                       1.40    
Proceeds from sale of stock     $ 1,190,000 $ 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            
Warrants expired unexercised 2014-05                                              
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                       850,000 384,534 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         850,000 384,534 2,198,571      
Number of warrants expired                               5,300,000