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ACQUISITIONS (Cambridge Semiconductor Limited) (Details) (USD $)
0 Months Ended
Jan. 02, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Loan to Cambridge Semiconductor   $ 6,600,000us-gaap_NotesAndLoansReceivableNetCurrent $ 0us-gaap_NotesAndLoansReceivableNetCurrent
Cambridge Semiconductor Limited [Member]      
Business Acquisition [Line Items]      
Loan to Cambridge Semiconductor   6,600,000us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_CounterpartyNameAxis
= powi_CambridgeSemiconductorLimitedMember
 
Subsequent Event [Member] | Cambridge Semiconductor Limited [Member]      
Business Acquisition [Line Items]      
Amount paid to acquire CamSemi $ 23,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember