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Fair Value Measurements Level 3 Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Jun. 02, 2014
Nov. 07, 2014
Recurring [Member] | Level 3 [Member]        
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]        
Balance, Beginning of Period $ 6,940us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
$ 1,660us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Cash payment (350)lpsn_BusinessCombinationContingentConsiderationPaymentOfAPortionOfPotentialEarnOutConsiderationAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
(750)lpsn_BusinessCombinationContingentConsiderationPaymentOfAPortionOfPotentialEarnOutConsiderationAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Balance, End of Period 6,590us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
6,940us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Synchronite, LLC [Member]        
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]        
Balance, End of Period     1,800us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= lpsn_SynchroniteLLCMember
 
Synchronite, LLC [Member] | Recurring [Member] | Level 3 [Member]        
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]        
Synchronite addition 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= lpsn_SynchroniteLLCMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
1,810us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= lpsn_SynchroniteLLCMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Contact At Once! [Member]        
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]        
Balance, Beginning of Period       4,200us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= lpsn_ContactAtOnceMember
Balance, End of Period       4,200us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= lpsn_ContactAtOnceMember
Contact At Once! [Member] | Recurring [Member] | Level 3 [Member]        
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]        
Synchronite addition 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= lpsn_ContactAtOnceMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
4,220us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= lpsn_ContactAtOnceMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Contingent Earn-Out [Member] | Synchronite, LLC [Member] | Recurring [Member] | Level 3 [Member]        
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]        
Synchronite addition     1,800us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= lpsn_SynchroniteLLCMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= lpsn_ContingentEarnOutMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Contingent Earn-Out [Member] | Contact At Once! [Member] | Recurring [Member] | Level 3 [Member]        
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]        
Synchronite addition       $ 4,200us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= lpsn_ContactAtOnceMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= lpsn_ContingentEarnOutMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember