v3.19.3.a.u2
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol ROKU    
Entity Registrant Name ROKU, INC    
Entity Central Index Key 0001428439    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity File Number 001-38211    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-2087865    
Entity Address, Address Line One 150 Winchester Circle    
Entity Address, City or Town Los Gatos    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95032    
City Area Code 408    
Local Phone Number 556-9040    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Title of 12(b) Security Class A Common Stock, $0.0001 par value    
Security Exchange Name NASDAQ    
Entity Public Float     $ 7,714,110,102
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Part III incorporates by reference certain information from the Registrant’s definitive proxy statement (the “2019 Proxy Statement”) for the 2020 Annual Meeting of Stockholders. The 2019 Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2019.

 

    
Class A Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   94,759,950  
Class B Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   25,218,517