Annual report pursuant to Section 13 and 15(d)

GOODWILL & INTANGIBLE ASSETS - Goodwill (Details)

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GOODWILL & INTANGIBLE ASSETS - Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 2,252,000  
Foreign currency translation adjustment (4,568,000)  
Goodwill, Ending Balance 639,301,000  
Accumulated impairment losses 0 $ 0
Acquisition of EnvisionTEC    
Goodwill [Line Items]    
Acquisition 195,688,000  
Goodwill, Ending Balance 16,400,000  
Adaptive 3D Technologies Inc    
Goodwill [Line Items]    
Acquisition 35,113,000  
Aerosint    
Goodwill [Line Items]    
Acquisition 14,581,000  
Dental Arts Labs    
Goodwill [Line Items]    
Acquisition 8,839,000  
AIDRO    
Goodwill [Line Items]    
Acquisition 3,515,000  
Brewer Dental Lab, Inc.    
Goodwill [Line Items]    
Acquisition 2,463,000  
May Dental Lab, Inc.    
Goodwill [Line Items]    
Acquisition 6,782,000  
ExOne Company    
Goodwill [Line Items]    
Acquisition $ 374,636,000