v3.26.1
RESTRUCTURING - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
RESTRUCTURING            
Percentage of reduction in workforce   7.00%        
Restructuring and related charges $ 0 $ 6,600,000 $ 0 $ 6,569,000 $ 0 $ 0
Cash severance charges       400,000    
Total stock-based compensation expense 11,258,000   10,077,000 17,565,000 18,760,000  
Related department costs   $ 3,000,000.0        
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfRevenue            
RESTRUCTURING            
Restructuring and related charges 0   0 365,000 0  
Total stock-based compensation expense 707,000   592,000 1,176,000 1,249,000  
Location, Statement of Income, Balance [Axis]: us-gaap:OperatingExpenses            
RESTRUCTURING            
Restructuring and related charges 0   0 6,204,000 0  
Location, Statement of Income, Balance [Axis]: us-gaap:OtherOperatingIncomeExpenseNet            
RESTRUCTURING            
Total stock-based compensation expense 522,000   0 (897,000) 0  
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense            
RESTRUCTURING            
Total stock-based compensation expense 3,036,000   3,190,000 4,940,000 5,440,000  
Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense            
RESTRUCTURING            
Total stock-based compensation expense 6,993,000   6,295,000 10,519,000 12,071,000  
Location, Statement of Income, Balance [Axis]: powi:RestructuringAndRelatedChargesIncludedInOperatingExpenses            
RESTRUCTURING            
Total stock-based compensation expense $ 0   $ 0 $ 1,827,000 $ 0