Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS - Business Combination common shares issued (Details)

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ACQUISITIONS - Business Combination common shares issued (Details)
12 Months Ended
Dec. 09, 2020
D
$ / shares
shares
Dec. 31, 2020
D
shares
Business Acquisition [Line Items]    
Number of trading days | D 20  
Number of days window by fifth anniversary of business combination | D 30  
Number of trading days not yet passed since the date of business combination | D   20
Tranche One    
Business Acquisition [Line Items]    
Trine Founder Shares 5,552,812  
Vesting percentage 75.00%  
Tranche Two    
Business Acquisition [Line Items]    
Trine Founder Shares 1,850,938  
Vesting percentage 25.00%  
Trine    
Business Acquisition [Line Items]    
BALANCE (in shares) 30,015,000  
Less: redemption of Trine shares (26,049)  
Common stock of Trine 29,988,951  
Trine Founder Shares 5,552,812 7,403,750
Trine Director Shares 100,000  
Share price | $ / shares $ 12.50  
Shares issued in PIPE 27,497,500  
Business Combination and PIPE financing shares 63,139,263  
Legacy Desktop Metal shares (1) 161,487,334  
BALANCE (in shares) 224,626,597