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Warrant Liability - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2008
Warrant liabilities [Member]
Mar. 31, 2013
Series A Warrants [Member]
Jun. 30, 2013
Series A Warrants [Member]
Nov. 30, 2008
November 2008 Financing [Member]
Jun. 30, 2013
November 2008 Financing [Member]
Nov. 30, 2008
November 2008 Financing [Member]
Common Stock [Member]
Nov. 30, 2009
November 2009 Financing [Member]
Jun. 30, 2013
November 2009 Financing [Member]
Nov. 30, 2009
November 2009 Financing [Member]
Common Stock [Member]
Dec. 31, 2011
December 2011 Financing [Member]
Mar. 31, 2013
December 2011 Financing [Member]
Series A Warrants [Member]
Jun. 30, 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]
Dec. 31, 2012
December 2011 Financing [Member]
Series B Warrant [Member]
Dec. 31, 2011
December 2011 Financing [Member]
Series B Warrant [Member]
Mar. 31, 2013
December 2011 Financing [Member]
Common Stock [Member]
Jun. 30, 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 23.00   15.00 15.00                     1.40    
Proceeds from sale of stock   $ 468,000   $ 18,637,000     $ 11,985,000       $ 468,000     $ 468,000                
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 warrants excercised                     334,534 2,198,571     2,700,000              
Number of shares issued upon warrants exercise                                 334,534 2,198,571 2,700,000      
Number of warrants issued                         2,700,000                  
Number of warrants expired                             5,300,000              
Number of Series A warrants in each unit issued in public offering                   1