XML 27 R1.htm IDEA: XBRL DOCUMENT v3.25.4
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 19, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 001-34112    
Entity Registrant Name Energy Recovery, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 01-0616867    
Entity Address, Address Line One 1717 Doolittle Drive    
Entity Address, City or Town San Leandro    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94577    
City Area Code 510    
Local Phone Number 483-7370    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol ERII    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 595
Entity Common Stock, Shares Outstanding (in shares)   52,828,666  
Documents Incorporated by Reference As noted herein, the information called for by Part III is incorporated by reference to specified portions of the registrant’s definitive proxy statement to be filed
in conjunction with the registrant’s 2026 Annual Meeting of Stockholders, which is expected to be filed not later than 120 days after the registrant’s fiscal year
ended December 31, 2025.
    
Entity Central Index Key 0001421517    
Document Fiscal Year Focus 2025    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Amendment Flag false