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Income Taxes - Additional Information (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes Disclosure [Line Items]      
Provision for federal or state income taxes   $ 0 $ 0
Net Operating Loss Carryforwards expiration start year 2023    
Net Operating Loss Carryforwards expiration ending year 2030    
Federal Tax credit expiration start year 2020    
Federal Tax credit expiration ending year 2032    
Net operating loss   10,600,000  
Net operating losses limited for year minimum   2013  
Net operating losses limited for year maximum   2027  
Remaining portion of net operating losses   90,300,000  
Gross unrecognized tax benefits   1,140,067 1,105,256
Unrecognized interest or penalties   0 0
Income tax examination year subject to examination, Range start 2001    
Income tax examination year subject to examination, Range End 2012    
Minimum [Member]
      
Income Taxes Disclosure [Line Items]      
Net operating losses limited for use utilized on an annual basis   200,000  
Maximum [Member]
      
Income Taxes Disclosure [Line Items]      
Net operating losses limited for use utilized on an annual basis   2,100,000  
U.S. Federal Government [Member]
      
Income Taxes Disclosure [Line Items]      
Net operating loss carryforwards 100,900,000    
Tax credit carryforwards 21,800,000    
State and Local Jurisdiction [Member]
      
Income Taxes Disclosure [Line Items]      
Net operating loss carryforwards 64,200,000    
Immaterial error related to net operating loss carryforwards $ 1,200,000