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Schedule of Diluted Earning Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income	$ 9,954us-gaap_NetIncomeLoss	$ 6,635us-gaap_NetIncomeLoss	$ 7,862us-gaap_NetIncomeLoss
Dividends accumulated for the period		(4,879)us-gaap_DividendsAndInterestPaid
Net income available to shareholders of ordinary shares	$ 9,954us-gaap_NetIncomeLossAttributableToParentDiluted	$ 1,756us-gaap_NetIncomeLossAttributableToParentDiluted	$ 7,862us-gaap_NetIncomeLossAttributableToParentDiluted
Denominator:
Shares used in computing net income per ordinary shares, diluted	29,704,730us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,765,914us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	25,245,790us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

X

- Definition

The contractual amount of dividends (or interest on participating income bonds) that must be paid for the current period (for example, unpaid cumulative dividends).

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent, and includes adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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