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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Tax Disclosure [Line Items]        
Net operating loss carryforwards federal $ 81,100,000   $ 81,100,000  
Net operating loss carryforwards state 56,900,000   56,900,000  
Operating loss carryforwards, expire beginning     2013  
Increase in liability for unrecognized tax benefit 0 1,000 1,000 2,000
Income tax (benefit) provision 168,000 34,000 (204,000) 63,000
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  
Income tax provision related current year activity 168,000   10,000  
Statutory tax rate     34.00%  
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