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Summary of Significant Accounting Policies (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
segment
reportingunit
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Cash equivalents $ 0   $ 0   $ 0
Inventory valuation reserves 1,900,000   1,900,000   300,000
Sales, general and administrative 15,008,000 $ 19,227,000 $ 48,430,000 $ 53,677,000  
Product return period     15 days    
Valuation allowances and reserves, amount 18,000   $ 18,000   36,000
Product shelf life     5 years    
Estimated useful lives     50 years    
Number of reportable segments | segment     1    
Number of reporting units | reportingunit     1    
Goodwill and intangible asset impairment 0       0
Asset impairment charges     $ 0   0
Foreign currency transaction gain (loss)     $ (5,400,000) (2,600,000)  
Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives     5 years    
Estimated useful lives     2 years    
Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives     10 years    
Estimated useful lives     15 years    
Shipping and Handling          
Summary Of Significant Accounting Policies [Line Items]          
Sales, general and administrative 800,000 $ 700,000 $ 2,200,000 2,100,000  
Product Concentration Risk | NuSil Technology LLC          
Summary Of Significant Accounting Policies [Line Items]          
Purchases from suppliers     12,100,000 $ 12,600,000  
Outstanding balance owed $ 600,000   $ 600,000   $ 2,700,000
Revenue | Geographic Concentration Risk | Brazil          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk (as a percent)     9.80% 16.30%  
Revenue | Geographic Concentration Risk | GERMANY          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk (as a percent)     10.10%    
Purchases | Product Concentration Risk          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk (as a percent)     67.10% 60.30%  
Customer One | Customer concentration risk          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk (as a percent)     10.30%   10.20%