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CONSOLIDATED STATEMENTS OF INCOME (LOSS) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
NET REVENUES $ 348,797us-gaap_Revenues $ 347,089us-gaap_Revenues $ 305,370us-gaap_Revenues
COST OF REVENUES 159,227us-gaap_CostOfRevenue 163,853us-gaap_CostOfRevenue 154,868us-gaap_CostOfRevenue
GROSS PROFIT 189,570us-gaap_GrossProfit 183,236us-gaap_GrossProfit 150,502us-gaap_GrossProfit
OPERATING EXPENSES:      
Research and development 54,981us-gaap_ResearchAndDevelopmentExpense 51,654us-gaap_ResearchAndDevelopmentExpense 45,709us-gaap_ResearchAndDevelopmentExpense
Sales and marketing 47,796us-gaap_SellingAndMarketingExpense 45,466us-gaap_SellingAndMarketingExpense 37,998us-gaap_SellingAndMarketingExpense
General and administrative 30,997us-gaap_GeneralAndAdministrativeExpense 32,050us-gaap_GeneralAndAdministrativeExpense 30,243us-gaap_GeneralAndAdministrativeExpense
Charge related to SemiSouth (Note 12) 0powi_OtherChargesWriteoffsRelatedToSemisouth 0powi_OtherChargesWriteoffsRelatedToSemisouth 25,200powi_OtherChargesWriteoffsRelatedToSemisouth
Total operating expenses 133,774us-gaap_OperatingExpenses 129,170us-gaap_OperatingExpenses 139,150us-gaap_OperatingExpenses
INCOME FROM OPERATIONS 55,796us-gaap_OperatingIncomeLoss 54,066us-gaap_OperatingIncomeLoss 11,352us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE):      
Interest income 1,203us-gaap_InvestmentIncomeInterest 736us-gaap_InvestmentIncomeInterest 1,747us-gaap_InvestmentIncomeInterest
Interest expense 0us-gaap_InterestExpense (23)us-gaap_InterestExpense (2)us-gaap_InterestExpense
Charge related to SemiSouth (Note 12) 0us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges (33,745)us-gaap_AssetImpairmentCharges
Other, net (185)us-gaap_OtherNonoperatingIncomeExpense 648us-gaap_OtherNonoperatingIncomeExpense (134)us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense) 1,018us-gaap_NonoperatingIncomeExpense 1,361us-gaap_NonoperatingIncomeExpense (32,134)us-gaap_NonoperatingIncomeExpense
INCOME (LOSS) BEFORE INCOME TAXES 56,814us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 55,427us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (20,782)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
PROVISION FOR (BENEFIT FROM) INCOME TAXES (2,730)us-gaap_IncomeTaxExpenseBenefit (1,839)us-gaap_IncomeTaxExpenseBenefit 13,622us-gaap_IncomeTaxExpenseBenefit
NET INCOME (LOSS) $ 59,544us-gaap_NetIncomeLoss $ 57,266us-gaap_NetIncomeLoss $ (34,404)us-gaap_NetIncomeLoss
EARNINGS (LOSS) PER SHARE:      
Basic (per share) $ 1.99us-gaap_EarningsPerShareBasic $ 1.95us-gaap_EarningsPerShareBasic $ (1.20)us-gaap_EarningsPerShareBasic
Diluted (per share) $ 1.93us-gaap_EarningsPerShareDiluted [1] $ 1.88us-gaap_EarningsPerShareDiluted [1] $ (1.20)us-gaap_EarningsPerShareDiluted [1]
SHARES USED IN PER SHARE CALCULATION:      
Basic (in shares) 29,976us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 29,421us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 28,636us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 30,829us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 30,420us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 28,636us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1]
[1] The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded all performance-based awards underlying the 2014 awards in the 2014 calculation as the performance conditions for those awards were not met as of the end of the period. The Company has included the shares underlying the 2013 and 2012 awards in the respective year calculations, as those shares were contingently issuable upon the satisfaction of the annual targets consisting of net revenue, non-GAAP operating earnings and achievement of strategic goals as of the end of the periods.