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Organization and Significant Accounting Policies - Additional Information (Detail)
€ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Segment
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
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 0 0    
Capital loss from the sale of investment     (404,000)    
Amount of grants recorded as reduction in research and development expense 6,410,000 4,997,000 4,586,000    
Tax credits on research and development expenses $ 1,485,000 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 $ 1,020,000 733,000 561,000    
Severance pay expense, net of related income 1,348,000 1,285,000 1,113,000    
Excess tax benefit from equity-based compensation as financing cash flows 0 112,000 0    
Impairment loss 0        
Allowance for doubtful accounts trade receivable 0 25,000      
Advertising expense $ 1,033,000 $ 928,000 $ 792,000    
Antidilutive shares excluded from computation of earnings per share | shares 282,696 820,631 3,316,380    
Foreign exchange forward and option contracts | Derivatives designated as cash flow hedging instruments          
Significant Accounting Policies [Line Items]          
Notional principal amount of Hedging Contracts $ 3,300,000 $ 3,200,000      
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%        
Stock Options, Stock Appreciation Rights and Employee Stock Purchase Plan          
Significant Accounting Policies [Line Items]          
Unrecognized compensation expense $ 1,724,000        
Unrecognized compensation expense, weighted-average period of recognition 1 year 4 months 24 days        
Restricted Stock Units (RSUs)          
Significant Accounting Policies [Line Items]          
Unrecognized compensation expense $ 7,559,000        
Unrecognized compensation expense, weighted-average period of recognition 1 year 6 months        
Short-term investments          
Significant Accounting Policies [Line Items]          
Interest rate bank deposits 1.76% 1.51% 1.58% 1.51% 1.58%
Long-term investments          
Significant Accounting Policies [Line Items]          
Interest rate bank deposits 1.97% 1.82% 1.74% 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)