REVENUE - Schedule of Revenue Streams (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 334,643	$ 270,731	$ 958,383	$ 921,375
Perpetual license
Disaggregation of Revenue [Line Items]
Revenue	2,747	9,223	4,729	18,929
Subscription license
Disaggregation of Revenue [Line Items]
Revenue	74,342	31,112	200,066	210,245
Consulting
Disaggregation of Revenue [Line Items]
Revenue	55,976	55,511	167,396	175,451
Subscription services
Disaggregation of Revenue [Line Items]
Revenue	201,578	174,885	586,192	516,750
Subscription
Disaggregation of Revenue [Line Items]
Revenue	275,920	205,997	786,258	726,995
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenue	77,089	40,335	204,795	229,174
Revenue recognized at a point in time | Perpetual license
Disaggregation of Revenue [Line Items]
Revenue	2,747	9,223	4,729	18,929
Revenue recognized at a point in time | Subscription license
Disaggregation of Revenue [Line Items]
Revenue	74,342	31,112	200,066	210,245
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenue	257,554	230,396	753,588	692,201
Revenue recognized over time | Maintenance
Disaggregation of Revenue [Line Items]
Revenue	83,538	77,526	245,210	235,568
Revenue recognized over time | Pega Cloud
Disaggregation of Revenue [Line Items]
Revenue	118,040	97,359	340,982	281,182
Revenue recognized over time | Consulting
Disaggregation of Revenue [Line Items]
Revenue	$ 55,976	$ 55,511	$ 167,396	$ 175,451