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SIGNIFICANT CUSTOMERS AND EXPORT SALES (International Sales) (Details) (Geographic Concentration Risk [Member], Sales Revenue, Goods, Net [Member])
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk percentage of net revenue 95.00%powi_ConcentrationRiskPercentageOfNetRevenue 95.00%powi_ConcentrationRiskPercentageOfNetRevenue 95.00%powi_ConcentrationRiskPercentageOfNetRevenue
Hong Kong/China [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk percentage of net revenue 47.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CN
47.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CN
45.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CN
Taiwan [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk percentage of net revenue 15.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_TW
15.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_TW
17.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_TW
Korea [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk percentage of net revenue 11.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_KR
11.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_KR
12.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_KR
Western Europe Excluding Germany [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk percentage of net revenue 11.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= powi_WesternEuropeExcludingGermanyMember
11.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= powi_WesternEuropeExcludingGermanyMember
10.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= powi_WesternEuropeExcludingGermanyMember
Japan [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk percentage of net revenue 5.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_JP
5.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_JP
6.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_JP
Singapore [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk percentage of net revenue 1.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_SG
2.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_SG
2.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_SG
Germany [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk percentage of net revenue 2.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_DE
2.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_DE
1.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_DE
Other Countries [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk percentage of net revenue 3.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= powi_OtherCountriesMember
2.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= powi_OtherCountriesMember
2.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= powi_OtherCountriesMember