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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 15 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2014 | Nov. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2009 | Oct. 31, 2008
Expiration period |  |  | 10 years |  |  |  |  |  |  |
Ordinary shares reserved for issuance |  |  | 8,639,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized |  |  |  |  |  |  |
Ordinary shares available for future grant |  |  | 1,251,780 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |  |  |  |  |  |
Average market value, trading day period | 30 days | 30 days |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  |  | $ 573 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  | $ 149 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |  |  |
Unrecognized compensation cost, period for recognition |  |  | 8 months 26 days |  |  |  |  |  |  |
Total unrecognized compensation cost |  |  | 3,345 us-gaap_AllocatedShareBasedCompensationExpense | [1] | 3,822 us-gaap_AllocatedShareBasedCompensationExpense | [1] | 5,460 us-gaap_AllocatedShareBasedCompensationExpense | [1] |  |
Stock repurchase, authorized amount |  |  |  |  |  |  |  |  |  | 20,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock repurchased during period, shares |  |  |  |  |  |  |  |  | 3,481,523 us-gaap_StockRepurchasedDuringPeriodShares |
Stock repurchased, weighted average price per share |  |  |  |  |  |  |  |  | $ 5.74 us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare |
Stock repurchased during period, amount |  |  |  |  |  |  |  |  | 20,091 us-gaap_StockRepurchasedDuringPeriodValue |
Total proceeds from public offering | 45,149 us-gaap_StockIssuedDuringPeriodValueNewIssues | 34,959 us-gaap_StockIssuedDuringPeriodValueNewIssues | 45,149 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 34,959 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |
Additional Shares authorized | 2,850,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized | 1,600,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized |  |  |  |  |  |  |  |
Stock issued, shares | 21,250,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 14,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |  |
Issuance expenses | 400 us-gaap_PaymentsOfStockIssuanceCosts | 361 us-gaap_PaymentsOfStockIssuanceCosts |  |  |  |  |  |  |  |
Share price | $ 1.89 us-gaap_SaleOfStockPricePerShare | $ 2.40 us-gaap_SaleOfStockPricePerShare |  |  |  |  |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value of options granted |  |  | $ 0.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  | $ 1.99 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  | $ 3.82 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |  |
Total unrecognized compensation cost |  |  | 774 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value of options granted |  |  | $ 2.88 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Total unrecognized compensation cost |  |  | $ 769 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
[1] | Including $ 473, $ 674 and $ 2,086 compensation expenses related to RSUs for the year ended December 31, 2012, 2013 and 2014, respectively.

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