Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v2.4.0.8
Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Income Tax Expenses [Line Items]    
Reversal of deferred tax liabilities associated with unrecognized tax benefits related to international operations $ 138,000  
Tax benefit for federal alternative minimum tax credits and California R&D credits 107,000  
Tax benefit on reversed deferred tax liabilities and recognized AMT and R&D credits 245,000  
Valuation allowance 35,566,000 33,341,000
Net operating loss carryforwards federal 77,900,000  
Net operating loss carryforwards state 55,200,000  
Cumulative unrealized excess tax deductions 7,000,000  
Unrealized tax benefits, if realized, would increase in additional paid-in-capital 2,700,000  
Valuation allowance percentage against the state deferred tax asset 100.00%  
Minimum
    
Income Tax Expenses [Line Items]    
Operating loss carryforwards, expiration period 2014  
Maximum
    
Income Tax Expenses [Line Items]    
Operating loss carryforwards, expiration period 2033  
Federal
    
Income Tax Expenses [Line Items]    
Research and development tax credit carryforwards 1,100,000  
Federal | Minimum
    
Income Tax Expenses [Line Items]    
Operating loss carryforwards, expiration period 2018  
Federal | Maximum
    
Income Tax Expenses [Line Items]    
Operating loss carryforwards, expiration period 2033  
State | Indefinite Life
    
Income Tax Expenses [Line Items]    
Research and development tax credit carryforwards $ 689,000