Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Feb. 17, 2021
Jan. 01, 2021
Significant Accounting Policies [Line Items]        
Deferred revenue $ 23.3 $ 22.7    
Cumulative Effect, Period of Adoption, Adjustment | ASU 2021-08 | Acquisition of EnvisionTEC        
Significant Accounting Policies [Line Items]        
Deferred revenue     $ 0.2 $ 0.2
Cumulative Effect, Period of Adoption, Adjustment | ASU 2021-08 | ExOne Company        
Significant Accounting Policies [Line Items]        
Deferred revenue       $ 12.5