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MARKETABLE SECURITIES - Unrealized Losses (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
MARKETABLE SECURITIES |  |  |  |
Unrealized losses on marketable securities | $ 0 | $ 0 | $ 0 | $ 0

X
- Definition Amount of unrealized loss on investment in securities classified as available-for-sale recognized in earnings. + References No definition available. + Details
Name: | powi_AvailableForSaleSecuritiesUnrealizedLossesRecognizedInEarnings
Namespace Prefix: | powi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration