CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 59,544us-gaap_NetIncomeLoss	$ 57,266us-gaap_NetIncomeLoss	$ (34,404)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	15,884us-gaap_Depreciation	16,088us-gaap_Depreciation	15,256us-gaap_Depreciation
Amortization of intangibles	6,072us-gaap_AmortizationOfIntangibleAssets	7,404us-gaap_AmortizationOfIntangibleAssets	5,164us-gaap_AmortizationOfIntangibleAssets
Charge related to SemiSouth (Note 12)	0	0	58,945
Loss (gain) on disposal of property and equipment	250	(131)	(1)
Gain on sale of asset held for sale	0us-gaap_GainLossOnDispositionOfAssets	(497)us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets
Stock-based compensation expense	14,282us-gaap_ShareBasedCompensation	16,485us-gaap_ShareBasedCompensation	14,224us-gaap_ShareBasedCompensation
Amortization of premium on marketable securities	1,694	789	850
Non-cash interest income from SemiSouth note	0	0	(1,445)
Deferred income taxes	157us-gaap_DeferredIncomeTaxExpenseBenefit	(2,781)us-gaap_DeferredIncomeTaxExpenseBenefit	2,017us-gaap_DeferredIncomeTaxExpenseBenefit
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)	70	(127)	(24)
Excess tax benefit from employee stock plans	(437)	(734)	(704)
Tax benefit associated with employee stock plans	815	1,284	1,303
Change in operating assets and liabilities:
Accounts receivable	2,133	(4,936)	5,313
Inventories	(21,703)us-gaap_IncreaseDecreaseInInventories	2,375us-gaap_IncreaseDecreaseInInventories	18,026us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	8,211	(1,523)	(11,008)
Accounts payable	2,337	2,467	2,071
Taxes payable and accrued liabilities	(3,242)	1,065	(26,029)
Deferred income on sales to distributors	(505)powi_IncreaseDecreaseinDeferredIncome	4,177powi_IncreaseDecreaseinDeferredIncome	2,276powi_IncreaseDecreaseinDeferredIncome
Net cash provided by operating activities	85,562	98,671	51,830
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(23,071)	(13,960)	(16,358)
Proceeds from sale of property and equipment	0	36	2
Proceeds from sale of assets held for sale	0	959	0
Other assets	(1,261)	0	0
Acquisition (Note 11)	0	0	(115,720)
Payment of guarantee of SemiSouth debt (Note 12)	0powi_PaymentOfGuaranteeObligation	0powi_PaymentOfGuaranteeObligation	(15,200)powi_PaymentOfGuaranteeObligation
Increase in financing lease receivables	0	0	(420)
Collections of financing lease receivables and other receivables	0	433	527
Loans to third parties (Notes 11 and 12)	(6,600)	0	(18,000)
Purchases of marketable securities	45,269	109,482	0
Proceeds from sales and maturities of marketable securities	38,052	31,350	40,463
Net cash used in investing activities	(38,149)	(90,664)	(124,706)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock under employee stock plans	13,855	30,239	21,952
Repurchase of common stock	(80,760)	0	(20,467)
Payments of dividends to stockholders	(13,165)us-gaap_PaymentsOfDividends	(9,446)us-gaap_PaymentsOfDividends	(5,755)us-gaap_PaymentsOfDividends
Excess tax benefit from employee stock plans	437	734	704
Net cash (used in) provided by financing activities	(79,633)	21,527	(3,566)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(32,220)	29,534	(76,442)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	92,928	63,394	139,836
CASH AND CASH EQUIVALENTS AT END OF PERIOD	60,708	92,928	63,394
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment	1,733	2,862	1,008
Fair value of SemiSouth purchase option (Note 12)	0powi_FairValueOfPurchaseOption	0powi_FairValueOfPurchaseOption	6,216powi_FairValueOfPurchaseOption
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid (refund) for income taxes, net of refunds (Note 8)	$ (3,121)us-gaap_IncomeTaxesPaidNet	$ (4,137)us-gaap_IncomeTaxesPaidNet	$ 46,689us-gaap_IncomeTaxesPaidNet

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Article 9

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Amount of amortization of other deferred costs recognized in the income statement.

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The net cash outflow or inflow for other changes, net, in the loan and lease balances held for investment purposes that are not separately disclosed. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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The cash outflow to reacquire common stock during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow for the purchase of receivables arising from the lease of real estate, equipment or other fixed assets for a specified time in exchange for payment, usually in the form of rent.

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The cash outflow for acquisition of or capital improvements on other tangible or intangible assets not otherwise defined in the taxonomy.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow associated with the sale or collection of receivables arising from the lease of real estate, equipment or other fixed assets for a specified time in exchange for payment, usually in the form of rent; excludes proceeds from sales-type lease transactions, which are classified as operating activities.

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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