Quarterly report pursuant to Section 13 or 15(d)

GOODWILL & INTANGIBLE ASSETS - Goodwill (Details)

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GOODWILL & INTANGIBLE ASSETS - Goodwill (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 2,252  
Goodwill, Ending Balance 251,060  
Accumulated impairment losses 0 $ 0
Acquisition of EnvisionTEC    
Goodwill [Line Items]    
Acquisition 198,369  
Goodwill, Ending Balance 36,600  
Adaptive 3D Technologies Inc    
Goodwill [Line Items]    
Acquisition 35,265  
Aerosint    
Goodwill [Line Items]    
Acquisition $ 15,174