MARKETABLE SECURITIES - Unrealized Losses (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
MARKETABLE SECURITIES
Unrealized losses on marketable securities	$ 0	$ 0	$ 0	$ 0

Amount of unrealized loss on investment in securities classified as available-for-sale recognized in earnings.

No definition available.

Name:	powi_AvailableForSaleSecuritiesUnrealizedLossesRecognizedInEarnings
Namespace Prefix:	powi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration