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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]      
Operating loss carryforwards $ 1,399 $ 1,914  
State incentive tax credit carryforwards 1,694 1,257  
Valuation allowances 456 108  
Unrecognized tax benefits 1,832 1,139 $ 1,065
Potential increase (decrease) in income tax provision 1,200 $ 700  
Income tax interest and penalty recognized 15    
State [Member] | Net Operating Losses [Member]      
Income Taxes [Line Items]      
Valuation allowances 100    
State [Member] | Tax Incentive Credit Carryforwards [Member]      
Income Taxes [Line Items]      
Valuation allowances $ 300    
Minimum [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards, expiration date Dec. 31, 2017    
Tax credit carryforward, expiration date Dec. 31, 2018    
Possible reduction in unrecognized tax benefits resulting from audit settlements $ 500    
Maximum [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards, expiration date Dec. 31, 2035    
Tax credit carryforward, expiration date Dec. 31, 2021    
Possible increase in unrecognized tax benefits resulting from audit settlements $ 500