REVENUE - Revenue Stream (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 274,337	$ 325,702	$ 650,644	$ 639,201
Perpetual license
Disaggregation of Revenue [Line Items]
Revenue	2,266	12,596	9,706	18,048
Subscription license
Disaggregation of Revenue [Line Items]
Revenue	41,600	104,296	179,133	215,805
Subscription services
Disaggregation of Revenue [Line Items]
Revenue	171,832	152,075	341,865	295,494
Subscription
Disaggregation of Revenue [Line Items]
Revenue	213,432	256,371	520,998	511,299
Consulting
Disaggregation of Revenue [Line Items]
Revenue	58,639	56,735	119,940	109,854
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenue	43,866	116,892	188,839	233,853
Revenue recognized at a point in time | Perpetual license
Disaggregation of Revenue [Line Items]
Revenue	2,266	12,596	9,706	18,048
Revenue recognized at a point in time | Subscription license
Disaggregation of Revenue [Line Items]
Revenue	41,600	104,296	179,133	215,805
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenue	230,471	208,810	461,805	405,348
Revenue recognized over time | Maintenance
Disaggregation of Revenue [Line Items]
Revenue	78,326	78,782	158,042	154,343
Revenue recognized over time | Pega Cloud
Disaggregation of Revenue [Line Items]
Revenue	93,506	73,293	183,823	141,151
Revenue recognized over time | Consulting
Disaggregation of Revenue [Line Items]
Revenue	$ 58,639	$ 56,735	$ 119,940	$ 109,854