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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]        
Retroactive tax relief     $ 500,000  
Gross tax credits $ (2,846,000) $ (110,000) (318,000)  
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards $ 27,800,000      
Federal net operating loss carryforward expiration year 2033      
State net operating loss carryforward expiration year 2015      
Period of cumulative change in ownership 3 years      
Annual limitation on use of net operating losses and tax credit carryforwards $ 3,700,000      
Current period excess stock-based compensation tax deduction 596,000 0 0  
Unrecognized federal and state tax benefits 259,000 657,000 2,409,000 $ 2,292,000
Net unrecognized tax benefits $ 168,000 160,000 204,000  
Interest and penalties associated with unrecognized tax benefits   518,000 121,000  
Minimum [Member]        
Operating Loss Carryforwards [Line Items]        
Cumulative change in ownership percentage 50.00%      
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards [Line Items]        
State NOL carryforwards $ 9,600,000 5,900,000 100,000  
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards 85,700,000      
Portion of state NOL carryforwards, not able to be utilized before expiration 34,500,000 8,100,000 8,300,000  
Federal benefit 1,200,000 300,000 $ 300,000  
Deferred tax assets, operating loss carryforwad, excess tax benefits 2,900,000      
Federal And State Tax        
Operating Loss Carryforwards [Line Items]        
Unrecognized federal and state tax benefits 1,200,000 $ 1,100,000    
Internal Revenue Service (IRS) [Member]        
Operating Loss Carryforwards [Line Items]        
Gross tax credits $ 5,100,000      
Tax carryforward period 20 years      
Tax credit carryforward expiration year 2034      
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards $ 47,700,000      
Deferred tax assets, operating loss carryforwad, excess tax benefits $ 3,000,000