XML 37 R25.htm IDEA: XBRL DOCUMENT
v3.8.0.1

STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based Compensation Expense | The following table summarizes the stock-based compensation expense for the three and nine months ended September 30, 2017, and September 30, 2016:
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(In thousands) | 2017 |  | 2016 |  | 2017 |  | 2016
Cost of revenues | $ | 391 |  |  | $ | 348 |  |  | $ | 885 |  |  | $ | 731 |
Research and development | 2,173 |  |  | 1,934 |  |  | 6,158 |  |  | 5,343 |
Sales and marketing | 1,441 |  |  | 1,303 |  |  | 3,727 |  |  | 3,229 |
General and administrative | 2,521 |  |  | 2,204 |  |  | 7,052 |  |  | 5,914 |
Total stock-based compensation expense | $ | 6,526 |  |  | $ | 5,789 |  |  | $ | 17,822 |  |  | $ | 15,217 |
Summary of Option Activity Under the Plans | A summary of stock options outstanding as of September 30, 2017, and activity during the nine months then ended, is presented below:
| Shares (in thousands) |  | Weighted- Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2017 | 697 |  |  | $ | 28.62 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (106 | ) |  | $ | 29.96 |  |  |  |  |
Forfeited or expired | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2017 | 591 |  |  | $ | 28.38 |  |  | 2.15 |  | $ | 26,516 |
Vested and exercisable at September 30, 2017 | 591 |  |  |  |  | 2.15 |  | $ | 26,516 |
Performance Based Awards (PSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of PSUs outstanding as of September 30, 2017, and activity during the nine months then ended, is presented below:
| Shares (in thousands) |  | Weighted-Average Grant Date Fair Value Per Share |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2017 | 99 |  |  | $ | 46.25 |  |  |  |  |
Granted | 88 |  |  | $ | 63.99 |  |  |  |  |
Vested | (99 | ) |  | $ | 46.25 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2017 | 88 |  |  | $ | 63.99 |  |  | 0.25 |  | $ | 6,416 |
Outstanding and expected to vest at September 30, 2017 | 79 |  |  |  |  | 0.25 |  | $ | 5,768 |
Long-Term Performance-Based Awards (PRSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of PRSUs outstanding as of September 30, 2017, and activity during the nine months then ended, is presented below:
| Shares (in thousands) |  | Weighted-Average Grant Date Fair Value Per Share |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2017 | 150 |  |  | $ | 47.65 |  |  |  |  |
Granted | 71 |  |  | $ | 63.00 |  |  |  |  |
Vested | — |  |  | — |  |  |  |  |
Forfeited | (7 | ) |  | $ | 47.89 |  |  |  |  |
Outstanding at September 30, 2017 | 214 |  |  | $ | 52.75 |  |  | 1.26 |  | $ | 15,679 |
Outstanding and expected to vest at September 30, 2017 | 187 |  |  |  |  | 1.43 |  | $ | 13,693 |
Restricted Stock Units (RSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of RSUs outstanding as of September 30, 2017, and activity during the nine months then ended, is presented below:
| Shares (in thousands) |  | Weighted- Average Grant Date Fair Value Per Share |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2017 | 718 |  |  | $ | 47.54 |  |  |  |  |
Granted | 554 |  |  | $ | 60.71 |  |  |  |  |
Vested | (274 | ) |  | $ | 46.33 |  |  |  |  |
Forfeited | (34 | ) |  | $ | 49.90 |  |  |  |  |
Outstanding at September 30, 2017 | 964 |  |  | $ | 55.37 |  |  | 3.94 |  | $ | 70,536 |
Outstanding and expected to vest at September 30, 2017 | 864 |  |  |  |  | 2.02 |  | $ | 63,281 |

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

X
- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=powi_PerformanceBasedAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=powi_LongTermPerformancebasedUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |