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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Valuation allowances related to U.S. based deferred taxes $ 15,400,000 $ 11,300,000  
Valuation allowance $ 94,984,000 $ 90,774,000  
Statutory federal income tax rate 34.00% 34.00% 34.00%
Internal revenue code related to annual use of operating loss carry forwards annual use of the Company’s net operating loss and research and development credit carryforwards may be limited in the event a cumulative change in ownership of more than 50% occurs within a three-year period    
Estimated reduction in California net operating losses $ 31,100,000    
Internal revenue code, cumulative change in ownership (percent) 50.00%    
Settlements and lapses in statutes of limitations $ 0 $ 61,000  
Associated interest due to expiration of the applicable statutes of limitations for certain tax years 0 0  
Interest and penalties related to unrecognized tax benefits in the provision for income taxes 0 $ 0  
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 217,200,000    
Net operating loss expiration dates 2029 through 2035    
Research and development tax credit carryforwards $ 4,400,000    
Tax credits expiration dates 2027 through 2035    
California Franchise Tax Board      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 38,500,000    
Net operating loss expiration dates 2017 through 2035    
Research and development tax credit carryforwards $ 5,800,000    
Oregon Tax Authority      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 2,300,000    
Net operating loss expiration dates begin to expire in 2030    
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 29,500,000