Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 01, 2022
Jun. 30, 2021
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Transition Report false    
Entity File Number 001-15751    
Entity Registrant Name eMAGIN CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 56-1764501    
Entity Address, Address Line One 700 South Drive    
Entity Address, Address Line Two Suite 201    
Entity Address, City or Town Hopewell Junction    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 12533    
City Area Code 845    
Local Phone Number 838-7900    
Title of 12(b) Security Common Stock, $.001 Par Value Per Share    
Trading Symbol EMAN    
Security Exchange Name NYSE    
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     $ 235.8
Entity Common Stock, Shares Outstanding   72,979,479  
Documents Incorporated by Reference The information required by Part III of this Report, to the extent not set forth herein, is incorporated herein by reference from the registrant’s definitive proxy statement relating to the Annual Meeting of Stockholders to be held in 2022, which definitive proxy statement shall be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this Report relates.    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Central Index Key 0001046995    
Auditor Firm ID 49    
Auditor Name RSM US LLP    
Auditor Location Stamford, Connecticut