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 |
|
|
|
|
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| Significant Accounting Policies [Line Items] |
|
|
|
|
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| Intangible assets definite lives |
5 years 6 months
|
|
|
|
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| 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)
|
|
|