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Stockholders' Equity (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jun. 30, 2010
Jul. 23, 2014
Mar. 13, 2014
Dec. 10, 2012
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]              
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized   100,000,000us-gaap_CommonStockSharesAuthorized        
Common stock, shares issued (in shares) 57,039,125us-gaap_CommonStockSharesIssued   56,701,331us-gaap_CommonStockSharesIssued        
Common stock, shares outstanding (in shares) 54,584,170us-gaap_CommonStockSharesOutstanding   54,484,760us-gaap_CommonStockSharesOutstanding        
Common stock, par value (in dollars per share) $ 0.001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare        
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]              
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized   5,000,000us-gaap_PreferredStockSharesAuthorized        
Preferred stock, shares issued (in shares) 0us-gaap_PreferredStockSharesIssued   0us-gaap_PreferredStockSharesIssued        
Preferred stock, shares outstanding (in shares) 0us-gaap_PreferredStockSharesOutstanding   0us-gaap_PreferredStockSharesOutstanding        
Preferred stock, par value (in dollars per share) $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare   $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Aggregate Intrinsic Value $ 1,100,000lpsn_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedAggregateIntrinsicValue            
Treasury Stock, Shares 33,360us-gaap_TreasuryStockShares            
Weighted average fair value of stock options granted $ 4.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 6.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue          
Dividend yield 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 5 years 5 years          
Share-based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Period Used To Determine Volatility 5 years            
Stock option term 10 years            
Total value of stock options exercised 1,100,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised            
Incentive Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost related to nonvested share-based compensation arrangements 25,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= lpsn_IncentiveStockOptionMember
           
Weighted average recognition period of unrecognized compensation cost 2 years 7 months 6 days            
1998 Plan [Member] | Incentive Stock Option [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock available for issuance 5,850,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= lpsn_IncentiveStockOptionMember
/ us-gaap_PlanNameAxis
= lpsn_NineteenNinetyEightPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
2000 Plan [Member] | Incentive Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Increase in number of shares of common stock available for issuance 4,150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= lpsn_IncentiveStockOptionMember
/ us-gaap_PlanNameAxis
= lpsn_TwoThousandPlanMember
           
1998 and 2000 Plan [Member] | Incentive Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock available for issuance 10,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= lpsn_IncentiveStockOptionMember
/ us-gaap_PlanNameAxis
= lpsn_NineteenNinetyEightAndTwoThousandPlanMember
           
2009 Plan [Member] | Incentive Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock available for issuance 13,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= lpsn_IncentiveStockOptionMember
/ us-gaap_PlanNameAxis
= lpsn_TwoThousandNinePlanMember
           
Increase in number of shares of common stock available for issuance 6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= lpsn_IncentiveStockOptionMember
/ us-gaap_PlanNameAxis
= lpsn_TwoThousandNinePlanMember
           
2010 Employee Stock Purchase Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock available for issuance 519,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= lpsn_EmployeeStockPurchasePlanTwentyTenMember
    1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= lpsn_EmployeeStockPurchasePlanTwentyTenMember
     
2009 Plan [Member] | 2009 Plan [Member] | Incentive Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock available for issuance 23,817,744us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= lpsn_IncentiveStockOptionMember
/ lpsn_PeriodReportedAxis
= lpsn_AmendedMember
/ us-gaap_PlanNameAxis
= lpsn_TwoThousandNinePlanMember
           
Increase in number of shares of common stock available for issuance 4,250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= lpsn_IncentiveStockOptionMember
/ lpsn_PeriodReportedAxis
= lpsn_AmendedMember
/ us-gaap_PlanNameAxis
= lpsn_TwoThousandNinePlanMember
           
2012 Stock Repurchase Program [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock repurchase program, authorized amount         50,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= lpsn_A2012StockRepurchaseProgramMember
40,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= lpsn_A2012StockRepurchaseProgramMember
30,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= lpsn_A2012StockRepurchaseProgramMember
Stock repurchased during period, shares 176,172us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= lpsn_A2012StockRepurchaseProgramMember
           
Stock repurchase program, remaining authorized repurchase amount $ 8,200,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= lpsn_A2012StockRepurchaseProgramMember