Annual report pursuant to Section 13 and 15(d)

Revenue from Contracts with Customers Contract Assets and Liabilities (Details)

v3.20.4
Revenue from Contracts with Customers Contract Assets and Liabilities (Details)
€ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
EUR (€)
Disaggregation of Revenue [Line Items]        
Contract asset $ 0   $ 0  
Magnesium silicate product line        
Disaggregation of Revenue [Line Items]        
Contract liabilities 11,486     € 10,216
Deferred revenue 11,318     € 9,202
Revenue recognized 1,197 € 1,014    
Sulfate salts product line        
Disaggregation of Revenue [Line Items]        
Contract liabilities     9,000  
Deferred revenue 2,070   6,450  
Revenue recognized $ (4,374)   $ 2,550