Acquisitions - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Oct. 31, 2021	Jul. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill acquired in acquisition			$ 198,205
Goodwill			291,215	$ 95,192
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			4,900
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			(14,100)
e-bot7
Business Acquisition [Line Items]
Aggregate purchase price		$ 50,700
Cash payment in acquisition		24,300
Equity consideration in acquisition		20,200
Goodwill acquired in acquisition		45,100
Business acquisition transaction costs			1,500
Net assets acquired		5,533
Intangible assets acquired		7,714
Cash		1,325
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		8,800
Business Combination, Contingent Consideration, Liability		6,200
Goodwill		45,145
Intangible assets		7,714
e-bot7 | Customer Relationships
Business Acquisition [Line Items]
Intangible assets acquired		$ 2,611
Weighted Average Amortization Period		10 years
e-bot7 | Compensation expense
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 4,400
e-bot7 | Revenue earn out
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		3,900
Business Combination, Contingent Consideration, Liability		3,100
VoiceBase
Business Acquisition [Line Items]
Aggregate purchase price		$ 111,400
Cash payment in acquisition	$ 17,100
Equity consideration in acquisition	63,800
Goodwill acquired in acquisition	81,300
Business acquisition transaction costs			2,800
Net assets acquired	30,104
Intangible assets acquired	28,810
Cash	2,367
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	29,500
Business Combination, Contingent Consideration, Liability	22,500
Goodwill	81,265
Intangible assets	28,810
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 5,900
Business Acquisition, Equity Interest Issued or Issuable, Basis for Determining Value	The share conversion ratio of 0.0091 was applied to convert VoiceBase’s outstanding stock awards into shares of LivePerson’s common stock.
Business Acquisition, Equity Interest Issued or Issuable, Description	As part of the acquisition, we also assumed the VoiceBase Stock Plan and the outstanding vested and unvested options to purchase shares of common stock of VoiceBase thereunder, and such options become exercisable to purchase shares of LivePerson’s common stock, subject to appropriate adjustments to the number of shares and the exercise price of each such option. In connection with the above, we registered 16,322,217 vested shares and 5,167,530 unvested shares under the VoiceBase Stock Plan.
VoiceBase | Customer Relationships
Business Acquisition [Line Items]
Intangible assets acquired	$ 3,700
Weighted Average Amortization Period	5 years
VoiceBase | Compensation expense
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 5,800
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	800
VoiceBase | Purchase Price
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	16,700
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	4,500
VoiceBase | Management Retention Plan
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability	9,300
VoiceBase | Future Services
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	700
Tenfold
Business Acquisition [Line Items]
Aggregate purchase price	112,200
Cash payment in acquisition	56,900
Equity consideration in acquisition	42,000
Goodwill acquired in acquisition	71,800
Business acquisition transaction costs			$ 1,500
Net assets acquired	40,404
Intangible assets acquired	41,150
Cash	3,770
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	14,300
Business Combination, Contingent Consideration, Liability	10,100
Goodwill	71,783
Intangible assets	41,150
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 6,400
Business Acquisition, Equity Interest Issued or Issuable, Basis for Determining Value	The share conversion ratio of 0.0055 was applied to convert Tenfold’s outstanding stock awards into shares of LivePerson’s common stock.
Business Acquisition, Equity Interest Issued or Issuable, Description	As part of the acquisition, the Company also assumed the Tenfold Stock Plan and the outstanding vested and unvested options to purchase shares of common stock of Tenfold thereunder, and such options become exercisable to purchase shares of LivePerson’s common stock, subject to appropriate adjustments to the number of shares and the exercise price of each such option. In connection with the above, we registered 60,082,513 vested shares and 42,964,711 unvested shares under the Tenfold Stock Plan.
Business Acquisition, Value of Shares Prior to Acquisition	$ 31,500
Tenfold | Customer Relationships
Business Acquisition [Line Items]
Intangible assets acquired	$ 9,000
Weighted Average Amortization Period	15 years
Tenfold | Compensation expense
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 3,100
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	2,400
Tenfold | Purchase Price
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	6,900
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	13,500
Tenfold | Future Services
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	11,600
Tenfold | Purchase price paid in cash
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	7,100
Tenfold | Revenue earn out
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 4,000