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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 6 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jun. 30, 2013
Segment
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
November 2008 Financing [Member]
Nov. 30, 2008
November 2008 Financing [Member]
Common Stock [Member]
Nov. 30, 2008
November 2008 Financing [Member]
Warrant liabilities [Member]
Jun. 30, 2013
November 2009 Financing [Member]
Nov. 30, 2009
November 2009 Financing [Member]
Common Stock [Member]
Nov. 30, 2009
November 2009 Financing [Member]
Warrant liabilities [Member]
Mar. 31, 2013
December 2011 Financing [Member]
Common Stock [Member]
Dec. 31, 2012
December 2011 Financing [Member]
Common Stock [Member]
Jun. 30, 2013
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]
Jun. 30, 2013
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]
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         0.75     0.40       1     1      
Number of securities callable by warrants         1,034,483     400,000         8,000,000       8,000,000  
Exercise price of warrants       23.00 23.00   15.00 15.00               1.40 1.25  
Term of warrant           5 years     5 years       5 years       90 days  
Number of warrants excercised                                   2,700,000
Number of shares issued upon Series B warrants exercise                   334,534 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 derivative liability $ 8,277,443            $ 42,192                      
Impairment of goodwill 0                                  
Value of patent 0                                  
Accumulated other comprehensive income $ (35,090) $ 193,177 $ 193,177