Debt Instrument, Convertible, Consecutive Business Days Immediately Following Threshold Consecutive Trading Days

No definition available.

Name:	pega_DebtInstrumentConvertibleConsecutiveBusinessDaysImmediatelyFollowingThresholdConsecutiveTradingDays
Namespace Prefix:	pega_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Indicates amendment to accounting standards.

+ References

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- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The rate of interest that was being paid on the original debt issue that is being converted in the noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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DEBT - Convertible Senior Notes Narrative (Details)		1 Months Ended	12 Months Ended
DEBT - Convertible Senior Notes Narrative (Details)	Jan. 01, 2021 USD ($)	Feb. 29, 2020 USD ($) day $ / shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Redemption percentage		100.00%
Convertible senior notes, net			$ 590,722,000	$ 518,203,000
Impact of ASU adoption			416,088,000	$ 542,172,000	$ 539,010,000	$ 621,531,000
Cumulative-effect adjustment from adoption of ASU 2020-06	Accounting Standards Update 2020-06 [Member]			Accounting Standards Update 2020-06 [Member]
Retained earnings
Debt Instrument [Line Items]
Impact of ASU adoption			$ 276,449,000	$ 339,879,000	$ 410,919,000	$ 510,863,000
Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Convertible senior notes, net	$ 69,500,000
Impact of ASU adoption				(52,205,000)
Cumulative Effect, Period of Adoption, Adjustment \| Retained earnings
Debt Instrument [Line Items]
Impact of ASU adoption	9,400,000			$ 9,399,000
Cumulative Effect, Period of Adoption, Adjusted Balance
Debt Instrument [Line Items]
Convertible senior notes, net	$ 587,700,000
On or after March 1, 2023
Debt Instrument [Line Items]
Redemption percentage		100.00%
Convertible debt
Debt Instrument [Line Items]
Face amount		$ 600,000,000
Interest rate		0.75%	0.75%	0.75%
Initial conversion rate		7.4045
Debt conversion amount		$ 1,000
Initial conversion price (in dollars per share) \| $ / shares		$ 135.05
Convertible debt \| After the calendar quarter ending on June 30, 2020
Debt Instrument [Line Items]
Threshold percentage of stock price trigger		130.00%
Threshold trading days \| day		20
Threshold consecutive trading days \| day		30
Convertible debt \| Measurement period
Debt Instrument [Line Items]
Threshold percentage of stock price trigger		98.00%
Threshold consecutive trading days \| day		5
Threshold consecutive business days \| day		5
Convertible debt \| On or after March 1, 2023
Debt Instrument [Line Items]
Threshold percentage of stock price trigger		130.00%
Threshold trading days \| day		20
Threshold consecutive trading days \| day		30