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Entity Level Information - Composition of Revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Entity Wide Information Revenue From External Customer [Line Items]    
Total revenues $ 63,992 $ 116,251
Product Sales    
Entity Wide Information Revenue From External Customer [Line Items]    
Total revenues 63,627 115,807
Services    
Entity Wide Information Revenue From External Customer [Line Items]    
Total revenues $ 365 $ 444