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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes Disclosure [Line Items]      
Provision for federal or state income taxes $ 0 $ 0 $ 0
Net operating loss carryforwards expiration start year 2023    
Net operating loss carryforwards expiration ending year 2033    
Federal Tax credit expiration start year 2020    
Federal Tax credit expiration ending year 2033    
Net operating loss 8,500,000    
Net operating losses limited for year minimum 2014    
Net operating losses limited for year maximum 2027    
Remaining portion of net operating losses 96,300,000    
Net operating losses, recognized as a benefit through additional-paid-in-capital 1,800,000    
Gross unrecognized tax benefits 0 1,100,000  
Unrecognized interest or penalties 0 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 1,400,000    
U.S. Federal Government [Member]
      
Income Taxes Disclosure [Line Items]      
Net operating loss carryforwards 104,800,000    
US Federal Tax credits carry forward 23,700,000    
State and Local Jurisdiction [Member]
      
Income Taxes Disclosure [Line Items]      
Net operating loss carryforwards $ 60,300,000