Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENTS (Details)

v3.21.2
SUBSEQUENT EVENTS (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Aug. 11, 2021
USD ($)
$ / shares
Jul. 30, 2021
USD ($)
Jul. 02, 2021
USD ($)
Jun. 30, 2021
$ / shares
Dec. 31, 2020
$ / shares
Dec. 09, 2020
$ / shares
Subsequent Event [Line Items]            
Common stock par value (in dollars per share)       $ 0.0001 $ 0.0001 $ 0.0001
Restricted Stock Units            
Subsequent Event [Line Items]            
Vesting period       4 years    
Common Class A            
Subsequent Event [Line Items]            
Common stock par value (in dollars per share)       $ 0.0001    
ExOne Company | Stock Price is Between $9.70 and $7.94 per Share            
Subsequent Event [Line Items]            
Payment to acquire business | $ $ 192.0          
Purchase consideration | $ 575.0          
Common stock fair value issued for acquisition | $ $ 383.0          
Subsequent Event | Dental Arts Laboratories Inc            
Subsequent Event [Line Items]            
Payment to acquire business | $   $ 26.3        
Value of stock issued for acquisition | $   $ 11.0        
Subsequent Event | Dental Arts Laboratories Inc | Restricted Stock Units            
Subsequent Event [Line Items]            
Vesting period   4 years        
Subsequent Event | AIDRO Srl            
Subsequent Event [Line Items]            
Payment to acquire business | $     $ 6.0      
Value of stock issued for acquisition | $     $ 3.2      
Subsequent Event | AIDRO Srl | Restricted Stock Units            
Subsequent Event [Line Items]            
Vesting period     4 years      
Subsequent Event | ExOne Company            
Subsequent Event [Line Items]            
Consideration in cash and stock per share $ 25.50          
Cash consideration per share 8.50          
Subsequent Event | ExOne Company | Minimum            
Subsequent Event [Line Items]            
Share price $ 7.94          
Ownership percentage after merger 12.00%          
Subsequent Event | ExOne Company | Maximum            
Subsequent Event [Line Items]            
Share price $ 9.70          
Ownership percentage after merger 15.00%          
Subsequent Event | ExOne Company | Stock Price is Between $9.70 and $7.94 per Share            
Subsequent Event [Line Items]            
Exchange ratio 1.9274          
Average share price $ 8.82          
Subsequent Event | ExOne Company | Stock Price is Between $9.70 and $7.94 per Share | Minimum            
Subsequent Event [Line Items]            
Share price 7.94          
Subsequent Event | ExOne Company | Stock Price is Between $9.70 and $7.94 per Share | Maximum            
Subsequent Event [Line Items]            
Share price 9.70          
Subsequent Event | ExOne Company | Stock Price Greater Than $9.70            
Subsequent Event [Line Items]            
Share price $ 9.70          
Exchange ratio 1.7522          
Subsequent Event | ExOne Company | Stock price is Less Than $7.94            
Subsequent Event [Line Items]            
Share price $ 7.94          
Exchange ratio 2.1416          
Subsequent Event | ExOne Company | Common Class A            
Subsequent Event [Line Items]            
Common stock par value (in dollars per share) $ 0.0001