REVENUE - Revenue Stream (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 270,731	$ 256,268	$ 921,375	$ 895,469
Perpetual license
Disaggregation of Revenue [Line Items]
Revenue	9,223	2,874	18,929	20,922
Subscription license
Disaggregation of Revenue [Line Items]
Revenue	31,112	35,421	210,245	251,226
Subscription services
Disaggregation of Revenue [Line Items]
Revenue	174,885	161,557	516,750	457,051
Subscription
Disaggregation of Revenue [Line Items]
Revenue	205,997	196,978	726,995	708,277
Consulting
Disaggregation of Revenue [Line Items]
Revenue	55,511	56,416	175,451	166,270
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenue	40,335	38,295	229,174	272,148
Revenue recognized at a point in time | Perpetual license
Disaggregation of Revenue [Line Items]
Revenue	9,223	2,874	18,929	20,922
Revenue recognized at a point in time | Subscription license
Disaggregation of Revenue [Line Items]
Revenue	31,112	35,421	210,245	251,226
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenue	230,396	217,973	692,201	623,321
Revenue recognized over time | Maintenance
Disaggregation of Revenue [Line Items]
Revenue	77,526	83,188	235,568	237,531
Revenue recognized over time | Pega Cloud
Disaggregation of Revenue [Line Items]
Revenue	97,359	78,369	281,182	219,520
Revenue recognized over time | Consulting
Disaggregation of Revenue [Line Items]
Revenue	$ 55,511	$ 56,416	$ 175,451	$ 166,270