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
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Goodwill [Line Items]      
Goodwill, Beginning Balance   $ 639,301 $ 2,252
May Dental working capital adjustment   23  
Foreign currency translation adjustment   (32,114) (4,568)
Goodwill impairment $ (229,500) (229,500)  
Goodwill, Ending Balance 377,710 377,710 639,301
Acquisition of EnvisionTEC      
Goodwill [Line Items]      
Acquisition     195,688
Goodwill, Ending Balance $ 16,400 $ 16,400  
Adaptive 3D Technologies Inc      
Goodwill [Line Items]      
Acquisition     35,113
Aerosint      
Goodwill [Line Items]      
Acquisition     14,581
Dental Arts Labs      
Goodwill [Line Items]      
Acquisition     8,839
AIDRO      
Goodwill [Line Items]      
Acquisition     3,515
Brewer Dental Lab, Inc.      
Goodwill [Line Items]      
Acquisition     2,463
May Dental Lab, Inc.      
Goodwill [Line Items]      
Acquisition     6,782
ExOne Company      
Goodwill [Line Items]      
Acquisition     $ 374,636