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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) |  |

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