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Cover - shares
 6 Months Ended
Jun. 30, 2021
Feb. 24, 2022
Cover [Abstract]    
Document Type 10-Q/A  
Amendment Flag true  
Amendment Description This Amendment No. 1 on Form 10-Q/A amends our quarterly report on Form 10-Q for the quarter ended June 30, 2021, initially filed with the Securities and Exchange Commission on August 5, 2021 (the Original Form 10-Q). This Form 10-Q/A amends and restates Items 1, 2 and 4 of Part I of the Original Form 10-Q and adds Item 1A of Part II to the Original Form 10-Q and no other items in the Original Form 10-Q are amended hereby. In Item 1, this Form 10-Q/A includes our restated condensed consolidated interim financial statements for the three and six months ended June 30, 2021, including certain notes thereto. The restatement relates to certain investments of the Company which were classified as cash equivalents on the June 30, 2021 balance sheet which the Company has determined do not qualify as cash equivalents. Such investments have been reclassified and are now presented as marketable securities, the statement of cashflows also reflects the purchase and sale activity of such marketable securities for the six months ended June 30, 2021 and notes 1 and 11 to the condensed consolidated financial statements have also been amended. This restatement did not impact the results of operations, loss per share or shareholders’ equity for the three and six months ended June 30, 2021. This restatement, which only relates to the reclassification of certain investments from cash to marketable securities, does not affect the company’s net income/loss for any period nor does it have any material impact on liquidity and capital resources.  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2021  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2021  
Current Fiscal Year End Date --12-31  
Entity File Number 000-14893  
Entity Registrant Name RESEARCH FRONTIERS INCORPORATED  
Entity Central Index Key 0000793524  
Entity Tax Identification Number 11-2103466  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 240 CROSSWAYS PARK DRIVE  
Entity Address, City or Town WOODBURY  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 11797-2033  
City Area Code (516)  
Local Phone Number 364-1902  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol REFR  
Security Exchange Name NASDAQ  
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 Common Stock, Shares Outstanding   31,650,396