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Organization and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Segment shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
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
Amount of grants recorded as reduction in research and development expense |  | 4,417,000 | 6,410,000 | 4,997,000
Tax credits on research and development expenses |  | $ 1,555,000 | 1,485,000 | 1,414,000
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 |  | $ 988,000 | 1,020,000 | 733,000
Severance pay expense, net of related income |  | $ 1,413,000 | 1,348,000 | 1,285,000
Number of shares, Options/SAR units granted | shares | [1] | 0 |  |
Impairment loss |  | $ 0 |  |
Advertising expense |  | $ 1,118,000 | $ 1,033,000 | $ 928,000
Antidilutive shares excluded from computation of earnings per share | shares |  | 29,892 | 282,696 | 820,631
Foreign exchange forward and option contracts | Derivatives designated as cash flow hedging instruments |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Notional principal amount of Hedging Contracts |  | $ 0 | $ 3,300,000 |
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% |  |
Royalty Revenue | ASU 2014-09 |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Revenues recognized from sales-based royalties |  | $ 8,765,000 |  |
Stock Options, Stock Appreciation Rights and Employee Stock Purchase Plan |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Unrecognized compensation expense |  | $ 620,000 |  |
Unrecognized compensation expense, weighted-average period of recognition |  | 1 year 3 months 19 days |  |
Restricted Stock Units (RSUs) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Unrecognized compensation expense |  | $ 10,894,000 |  |
Unrecognized compensation expense, weighted-average period of recognition |  | 1 year 4 months 24 days |  |
Retained Earnings | ASU 2014-09 |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cumulative adjustment to increase in equity or assets |  | $ 8,055,000 |  |
Assets | ASU 2014-09 |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cumulative adjustment to increase in equity or assets |  | 9,117,000 |  |
Current Liabilities | ASU 2014-09 |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cumulative adjustment to increase in equity or assets |  | $ 1,062,000 |  |
Short-term investments |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Interest rate bank deposits |  | 1.85% | 1.76% | 1.51%
Long-term investments |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Interest rate bank deposits |  | 2.26% | 1.97% | 1.82%
[1] | The SAR units are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SAR units subject to the grant.

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