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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Income Taxes [Line Items]        
Deferred tax assets from share-based payments $ 1,079,000 $ 628,000    
Valuation allowance increase (decrease) 1,216,000 $ 727,000 $ (1,736,000)  
Impact of unrecognized tax benefits on effective tax rate 1,289,000      
Interest and penalties related to uncertain tax positions 272,000      
Earnings of foreign subsidiaries permanently reinvest outside the U.S 30,322,000      
Generated between 2010 and 2011 | Research and Development Credit        
Income Taxes [Line Items]        
Payment to DOR 141,000      
Tax Period Two Thousand Eight to Two Thousand Nine        
Income Taxes [Line Items]        
Payment to DOR $ 1,012,000      
Liability for an uncertain tax position       $ 926,000
Maximum        
Income Taxes [Line Items]        
Net operating loss and business tax credit carry forwards expiration date At various dates through December 2035      
Available to Reduce Future Federal Income Taxes        
Income Taxes [Line Items]        
Net operating loss carry forwards $ 46,984,000      
Business tax credit carry forwards 1,920,000      
Deferred tax assets from share-based payments 10,242,000      
Reserves for business tax credits 1,289,000      
Available to Reduce Future Federal Income Taxes | General Business Tax Credit Carryforward        
Income Taxes [Line Items]        
Business tax credit carry forwards $ 2,578,000