Organization and Significant Accounting Policies - Additional Information (Detail)	12 Months Ended													12 Months Ended				0 Months Ended	12 Months Ended		1 Months Ended
	Dec. 31, 2014 USD ($) Segment	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Minimum	Dec. 31, 2014 Maximum	Dec. 31, 2014 Foreign exchange forward and option contracts Derivatives designated as cash flow hedging instruments USD ($)	Dec. 31, 2013 Foreign exchange forward and option contracts Derivatives designated as cash flow hedging instruments USD ($)	Dec. 31, 2014 Short-term investments	Dec. 31, 2013 Short-term investments	Dec. 31, 2012 Short-term investments	Dec. 31, 2014 Long-term investments	Dec. 31, 2013 Long-term investments	Dec. 31, 2012 Long-term investments	Dec. 31, 2014 Antcor Advanced Network Technologies S.A USD ($)	Dec. 31, 2014 Antcor Advanced Network Technologies S.A EUR (€)	Dec. 31, 2014 Antcor Advanced Network Technologies S.A Scenario, Forecast [Member] USD ($)	Dec. 31, 2014 Antcor Advanced Network Technologies S.A Scenario, Forecast [Member] EUR (€)	Jul. 04, 2014 RivieraWaves USD ($)	Dec. 31, 2014 RivieraWaves USD ($)	Jul. 04, 2014 RivieraWaves USD ($)	Jan. 31, 2015 RivieraWaves Subsequent Event USD ($)
Significant Accounting Policies [Line Items]
Percentage of voting interests acquired																				100.00%
Cost of acquired entity, purchase price																		$ 18,378,000
Cost of acquired entity cash paid at closing																		14,678,000
Business acquisition, description of contingent consideration arrangements																			The remaining amount of $3,700 is payable upon the satisfaction of certain milestones (the "Contingent Consideration"). In January 2015, the Company paid $1,000 of the Contingent Consideration, and the remaining amount of $2,700 is expected to be paid within 2015.
Business acquisition, contingent consideration liability																				3,700,000	2,700,000
Estimated contingent consideration	3,603,000																		3,603,000
Contingent consideration paid																					1,000,000
Business acquisition, acquisition-related costs																		310,000
Business acquisition, description of acquired entity																			In addition, as part of the acquisition, the Company established an employee retention plan for the RivieraWaves employees at a cost of approximately $3,400, to be payable on a semiannual basis for a period of two years after the Closing Date.
Interest rate bank deposits								1.58%	1.88%	2.32%	1.74%	2.14%	2.40%
Impairment of long-lived asset	0	0	0
Date of annual test of impairment for goodwill	October 1st of each year
Number of operating segments	1
Impairment of goodwill	0
Intangible assets definite lives				1 year 6 months	5 years 6 months
Impairment of intangible assets	0
Business acquisition consideration received														1,032,000	774,000
Additional cash consideration receivable held for indemnification																120,000	99,000
Capital loss from the sale of investment														404,000
Royalty expenses percentage				3.00%	3.50%
Amount of grants recorded as reduction in research and development expense	4,586,000	3,304,000	2,849,000
Tax credits on research and development expenses	675,000
Pension contribution rate	10.00%
Percentage of match made by the employer up to a maximum of 6%	100.00%
Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan	6.00%
Maximum percentage contribute by each participant from base remuneration	15.00%
Employee plan contribution	561,000	338,000	313,000
Severance pay expense, net of related income	1,113,000	1,014,000	826,000
Unrecognized compensation expense	3,763,000
Unrecognized compensation expense, weighted-average period of recognition	1 year 4 months 24 days
Excess tax benefit from equity-based compensation as financing cash flows	0	0	672,000
Impairment loss	0
Allowance for doubtful accounts trade receivable	25,000	0
Notional principal amount of Hedging Contracts						4,200,000	720,000
Advertising expense	$ 792,000	$ 660,000	$ 791,000
Antidilutive shares excluded from computation of earnings per share	3,316,380	1,732,154	973,919