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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 05, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 000-30269    
Entity Registrant Name PIXELWORKS, INC    
Entity Incorporation, State or Country Code OR    
Entity Tax Identification Number 91-1761992    
Entity Address, Address Line One 226 Airport Parkway, Suite 595    
Entity Address, City or Town San Jose    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95110    
City Area Code 408    
Local Phone Number 200-9200    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol PXLW    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 115,004,218
Entity Public Float, Share Price     $ 3.23
Entity Common Stock, Shares Outstanding   52,212,421  
Documents Incorporated by Reference Part III incorporates information by reference to the registrant’s definitive proxy statement, to be filed with the Securities and Exchange Commission within 120 days after the close of the fiscal year ended December 31, 2020.    
Entity Central Index Key 0001040161    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
ICFR Auditor Attestation Flag false