Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Mar. 21, 2022
Document Information [Line Items]    
Document Type 10-K  
Document Annual Report true  
Document Transition Report false  
Document Period End Date Dec. 31, 2021  
Entity File Number 001-39417  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 84-4473840  
Entity Address State Or Province MA  
Entity Address, Address Line One 500 Totten Pond Road, 4th Floor  
Entity Address, City or Town Waltham  
Entity Address, Postal Zip Code 02451  
City Area Code 781  
Local Phone Number 374-8100  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
ICFR Auditor Attestation Flag false  
Entity Shell Company false  
Entity Public Float $ 173,017,500  
Entity Common Stock, Shares Outstanding   143,299,476
Entity Central Index Key 0001805385  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus FY  
Amendment Flag false  
Auditor Name PricewaterhouseCoopers LLP  
Auditor Firm ID 238  
Auditor Location Boston, Massachusetts  
Class A Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, $0.0001 Par Value per Share  
Trading Symbol EVLV  
Security Exchange Name NASDAQ  
Warrants to purchase one share of Class A common stock    
Document Information [Line Items]    
Title of 12(b) Security Warrants to purchase one share of Common Stock  
Trading Symbol EVLVW  
Security Exchange Name NASDAQ