Registration of securities issued in business combination transactions

SUBSEQUENT EVENTS (Details)

v3.21.2
SUBSEQUENT EVENTS (Details)
$ / shares in Units, $ in Millions
2 Months Ended 6 Months Ended 12 Months Ended
Aug. 11, 2021
USD ($)
$ / shares
Jul. 30, 2021
USD ($)
Jul. 02, 2021
USD ($)
Feb. 26, 2021
shares
Feb. 16, 2021
USD ($)
Mar. 10, 2021
shares
Jun. 30, 2021
$ / shares
Dec. 31, 2020
$ / shares
Dec. 09, 2020
$ / shares
Aug. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Subsequent Event [Line Items]                      
Vesting period               1 year      
Common stock par value (in dollars per share)             $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001
Restricted Stock Units                      
Subsequent Event [Line Items]                      
Vesting period             4 years 4 years      
Common Class A                      
Subsequent Event [Line Items]                      
Common stock par value (in dollars per share)             $ 0.0001 $ 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 | Private Placement Warrants                      
Subsequent Event [Line Items]                      
Warrants exercised on a cashless basis | shares           10,003,000          
Subsequent Event | Warrants                      
Subsequent Event [Line Items]                      
Warrants exercised for cash | shares       11,898,122              
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                    
Subsequent Event | EnvisionTEC US, LLC And Affiliates                      
Subsequent Event [Line Items]                      
Payment to acquire business | $         $ 143.8