Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Mar. 10, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-36467    
Entity Registrant Name RESONANT INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 45-4320930    
Entity Address, Address Line One 10900 Stonelake Blvd, Suite 100, Office 02-130    
Entity Address, City or Town Austin    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 78759    
City Area Code (805)    
Local Phone Number 308-9803    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol RESN    
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    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 115
Entity Common Stock, Shares Outstanding   60,119,538  
Documents Incorporated by Reference Portions of the registrant’s Proxy Statement for the registrant’s 2021 Annual Meeting of Stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K. Such Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of December 31, 2020, the last day of the fiscal year covered by this Annual Report on Form 10-K.    
Entity Central Index Key 0001579910    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY