Purchase Price Preliminary Allocation (Detail) (Look.io, USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Look.io
Business Acquisition [Line Items]
Intangible assets (technology)	$ 2,884
Goodwill	1,082
Business Acquisition Purchase Price Allocation Net Assets Acquired, Total	3,966
Deferred tax liability	(1,082)
Total purchase price consideration	$ 2,884

Business Acquisition, Purchase Consideration of Acquired Entity

No definition available.

Name:	lpsn_BusinessAcquisitionPurchaseConsiderationOfAcquiredEntity
Namespace Prefix:	lpsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Business Acquisition Purchase Price Allocation Deferred Tax Liability

+ References

No definition available.

+ Details

Name:	lpsn_BusinessAcquisitionPurchasePriceAllocationDeferredTaxLiability
Namespace Prefix:	lpsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Business Acquisition, Purchase Price Allocation, Intangible Assets

+ References

No definition available.

+ Details

Name:	lpsn_BusinessAcquisitionPurchasePriceAllocationIntangibleAssets
Namespace Prefix:	lpsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Business Acquisition Purchase Price Allocation Net Assets Acquired

+ References

No definition available.

+ Details

Name:	lpsn_BusinessAcquisitionPurchasePriceAllocationNetAssetsAcquired
Namespace Prefix:	lpsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 53

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant