Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.3.1.900
Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [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 $ (49,514,000) $ (42,069,000)  
Net operating loss carryforwards federal 109,500,000    
Net operating loss carryforwards state 71,800,000    
Cumulative unrealized excess tax deductions 6,900,000 6,900,000  
Unrealized tax benefits, if realized, would increase in additional paid-in-capital 2,600,000 2,600,000  
Valuation allowance percentage against the state deferred tax asset     100.00%
Undistributed earnings from foreign subsidiaries $ 0 $ 0  
Minimum      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards, expiration period 2018    
Maximum      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards, expiration period 2035    
Federal      
Income Tax Disclosure [Line Items]      
Research and development tax credit carryforwards $ 1,600,000    
Federal | Minimum      
Income Tax Disclosure [Line Items]      
Research and development tax credit carryforwards, expiration period 2018    
Federal | Maximum      
Income Tax Disclosure [Line Items]      
Research and development tax credit carryforwards, expiration period 2035    
State | Indefinite Life      
Income Tax Disclosure [Line Items]      
Research and development tax credit carryforwards $ 1,200,000