Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Mar. 10, 2021
Jun. 30, 2020
Document Information [Line Items]      
Document Type 10-K/A    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2020    
Current Fiscal Year End Date --12-31    
Entity File Number 001-38835    
Entity Registrant Name Desktop Metal, Inc.    
Entity Central Index Key 0001754820    
Entity Tax Identification Number 83-2044042    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 63 3rd Avenue    
Entity Address, City or Town Burlington    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 01803    
City Area Code 978    
Local Phone Number 224-1244    
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 true    
Elected Not To Use the Extended Transition Period false    
Entity Shell Company false    
Entity Public Float     $ 95,050
Entity Common Stock, Shares Outstanding   244,448,748  
ICFR Auditor Attestation Flag false    
Common Stock [Member]      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol DM    
Security Exchange Name NYSE    
Debentures 6.55% Due 2030      
Document Information [Line Items]      
Title of 12(b) Security Warrants to purchase common stock    
Trading Symbol DM.WS    
Security Exchange Name NYSE