Taxes on Income - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Effective income tax rate	140.00%	11.00%	13.00%
Increase in valuation allowance	$ 3,404,000
Unrecognized tax benefits	2,859,000	3,563,000	3,520,000
Accrued interest related to unrecognized tax benefits	39,000	226,000
Accrue penalties related to unrecognized tax benefits	0	0
Net operating loss carryforwards, federal	3,929,000
Excess tax benefits from stock option exercises	3,876,000
Loss carryforwards begin to expire	2030
Income not eligible for Approved Enterprise benefits
Income Taxes [Line Items]
Effective income tax rate	26.50%
Israel
Income Taxes [Line Items]
Effective income tax rate	25.00%
Increase in income tax rate	26.50%
Israel | Foreign ownership exceeds 90%
Income Taxes [Line Items]
Effective income tax rate	10.00%
Israel | Foreign ownership exceeds 49%
Income Taxes [Line Items]
Effective income tax rate	20.00%
Israel | Minimum
Income Taxes [Line Items]
Tax exemption period, undistributed income	2 years
Israel | Maximum
Income Taxes [Line Items]
Tax exemption period, undistributed income	10 years
Ireland
Income Taxes [Line Items]
Effective income tax rate	12.50%
Open tax years	Subject to review by the applicable taxing authorities for the Irish subsidiary, are 2010 and subsequent years.
Net operating loss carryforwards, foreign	63,422,000
Ireland | Interest income
Income Taxes [Line Items]
Effective income tax rate	25.00%
France
Income Taxes [Line Items]
Effective income tax rate	33.33%
Open tax years	Subject to review by the applicable taxing authorities for the French subsidiaries, are 2010 and subsequent years.
Net operating loss carryforwards, foreign	2,105,000
California state
Income Taxes [Line Items]
Loss carryforwards begin to expire	2015
Net operating loss carryforwards	6,315,000
Excess tax benefits from stock option exercises	$ 3,424,000