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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     8,639,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized        
Ordinary shares available for future grant     1,251,780us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant        
Average market value, trading day period 30 days 30 days          
Total intrinsic value of options exercised     $ 573us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 149us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue      
Unrecognized compensation cost, period for recognition     8 months 26 days        
Total unrecognized compensation cost     3,345us-gaap_AllocatedShareBasedCompensationExpense [1] 3,822us-gaap_AllocatedShareBasedCompensationExpense [1] 5,460us-gaap_AllocatedShareBasedCompensationExpense [1]    
Stock repurchase, authorized amount             20,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock repurchased during period, shares           3,481,523us-gaap_StockRepurchasedDuringPeriodShares  
Stock repurchased, weighted average price per share           $ 5.74us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare  
Stock repurchased during period, amount           20,091us-gaap_StockRepurchasedDuringPeriodValue  
Total proceeds from public offering 45,149us-gaap_StockIssuedDuringPeriodValueNewIssues 34,959us-gaap_StockIssuedDuringPeriodValueNewIssues 45,149us-gaap_StockIssuedDuringPeriodValueNewIssues 34,959us-gaap_StockIssuedDuringPeriodValueNewIssues      
Additional Shares authorized 2,850,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized 1,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized          
Stock issued, shares 21,250,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 14,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues          
Issuance expenses 400us-gaap_PaymentsOfStockIssuanceCosts 361us-gaap_PaymentsOfStockIssuanceCosts          
Share price $ 1.89us-gaap_SaleOfStockPricePerShare $ 2.40us-gaap_SaleOfStockPricePerShare          
Stock Option [Member]              
Weighted average grant date fair value of options granted     $ 0.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember		 $ 1.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember		 $ 3.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember		    
Total unrecognized compensation cost     774us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember		        
Restricted Stock Units (RSUs) [Member]              
Weighted average grant date fair value of options granted     $ 2.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		        
Total unrecognized compensation cost     $ 769us-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.