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Entity Level Information - Composition of Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Entity Wide Information Revenue From External Customer [Line Items]    
Total revenues $ 12,240 $ 12,706
Product Sales    
Entity Wide Information Revenue From External Customer [Line Items]    
Total revenues 12,238 12,695
Services    
Entity Wide Information Revenue From External Customer [Line Items]    
Total revenues $ 2 $ 11