Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Line Items]        
Net operating loss carryforwards federal $ 83,700,000   $ 83,700,000  
Net operating loss carryforwards state 59,500,000   59,500,000  
Operating loss carryforwards, expire beginning     2013  
Income tax (benefit) provision 22,000 34,000 (182,000) 97,000
Tax benefit for federal alternative minimum tax credits and California R&D credits     107,000  
Tax benefit on reversed certain deferred tax liabilities associated with international operations and research and development credits     214,000  
Statutory tax rate     34.00%  
Increase in liability for unrecognized tax benefit 0 2,000 1,000 4,000
Other Tax Benefits
        
Income Tax Disclosure [Line Items]        
Tax benefit on reversed certain deferred tax liabilities associated with international operations     107,000  
Federal
        
Income Tax Disclosure [Line Items]        
Research and development tax credit carryforwards 1,300,000   1,300,000  
Research and development tax credit carryforwards expire beginning     2018  
State
        
Income Tax Disclosure [Line Items]        
Research and development tax credit carryforwards $ 815,000   $ 815,000