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Organization and Significant Accounting Policies - Additional Information (Detail)
€ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Segment
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2015
EUR (€)
Dec. 31, 2014
EUR (€)
Significant Accounting Policies [Line Items]          
Impairment of long-lived asset $ 0 $ 0 $ 0    
Date of annual test of impairment for goodwill On October 1st of each year.        
Number of operating segments | Segment 1        
Impairment of goodwill $ 0        
Impairment of intangible assets 0        
Amount of grants recorded as reduction in research and development expense 4,997,000 4,586,000 3,304,000    
Tax credits on research and development expenses $ 1,414,000 675,000      
Pension contribution rate 10.00%        
Percentage of match made by the employer up to a maximum of 6% 100.00%        
Maximum percentage contribute by each participant from base remuneration 15.00%        
Employee plan contribution $ 733,000 561,000 338,000    
Severance pay expense, net of related income 1,285,000 1,113,000 1,014,000    
Excess tax benefit from equity-based compensation as financing cash flows 112,000 0 0    
Impairment loss 0        
Allowance for doubtful accounts trade receivable 25,000 25,000      
Advertising expense $ 928,000 $ 792,000 $ 660,000    
Antidilutive shares excluded from computation of earnings per share | shares 820,631 3,316,380 1,732,154    
Treasury stock          
Significant Accounting Policies [Line Items]          
Reclassification of retained earnings to additional paid-in capital $ 2,178,000        
Foreign exchange forward and option contracts | Derivatives designated as cash flow hedging instruments          
Significant Accounting Policies [Line Items]          
Notional principal amount of Hedging Contracts 3,200,000 $ 4,200,000      
Restricted Stock Units (RSUs)          
Significant Accounting Policies [Line Items]          
Unrecognized compensation expense $ 2,242,000        
Unrecognized compensation expense, weighted-average period of recognition 1 year 4 months 24 days        
Stock Options, SARs and.Employee Stock Purchase Plan          
Significant Accounting Policies [Line Items]          
Unrecognized compensation expense $ 3,475,000        
Unrecognized compensation expense, weighted-average period of recognition 1 year 8 months 12 days        
Minimum          
Significant Accounting Policies [Line Items]          
Intangible assets definite lives 1 year 6 months        
Royalty expenses percentage 3.00%        
Maximum          
Significant Accounting Policies [Line Items]          
Intangible assets definite lives 5 years 6 months        
Royalty expenses percentage 3.50%        
Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan 6.00%        
Accounting Standards Update 2015-17 [Member]          
Significant Accounting Policies [Line Items]          
Decrease to deferred tax assets, current   1,868,000      
Increase to deferred tax asset, noncurrent   864,000      
Decrease to deferred tax liability, current   464,000      
Decrease to deferred tax liability, noncurrent   $ 540,000      
Short-term investments          
Significant Accounting Policies [Line Items]          
Interest rate bank deposits 1.51% 1.58% 1.88% 1.51% 1.58%
Long-term investments          
Significant Accounting Policies [Line Items]          
Interest rate bank deposits 1.82% 1.74% 2.14% 1.82% 1.74%
Antcor Advanced Network Technologies S.A          
Significant Accounting Policies [Line Items]          
Business acquisition consideration received $ 111,000 $ 1,032,000   € 99 € 774
Capital loss from the sale of investment   $ 404,000