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Income Taxes - Expiry Dates of Federal and State Income Tax Credit Carryforwards (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
Federal  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards $ 15,136,000
Federal | U.S. foreign tax credit  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards $ 8,983,000
Federal | U.S. foreign tax credit | Minimum  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards, expiration year 2020
Federal | U.S. foreign tax credit | Maximum  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards, expiration year 2025
Federal | U.S. research tax credit  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards $ 6,135,000
Federal | U.S. research tax credit | Minimum  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards, expiration year 2030
Federal | U.S. research tax credit | Maximum  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards, expiration year 2035
Federal | U.S. business tax credits  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards $ 18,000
Federal | U.S. business tax credits | Minimum  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards, expiration year 2030
Federal | U.S. business tax credits | Maximum  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards, expiration year 2035
State  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards $ 11,994,000
State | State investment tax credits  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards 795,000
State | State research tax credits  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards $ 11,199,000