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Summary of Significant Accounting Policies - Bad debts and Concentration of Credit Risk (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Allowance for bad debt and credit activity    
Beginning balance $ 395 $ 211
Bad debt expense (benefit) (89) 228
Write-off of uncollectible accounts (2) (37)
Currency translation adjustment (15) (7)
Ending balance $ 289 $ 395
Customer Concentration Risk | Net sales    
Allowance for bad debt and credit activity    
Number of customers | item 2 1
Customer Concentration Risk | Net sales | Major Customer Number One    
Allowance for bad debt and credit activity    
Concentration risk (as a percent) 15.00% 18.00%
Customer Concentration Risk | Net sales | Major Customer Number Two    
Allowance for bad debt and credit activity    
Concentration risk (as a percent) 14.00%