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Revenue - Disaggregated by Type (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue    
Revenue $ 10,108 $ 10,026
Product sales    
Disaggregation of Revenue    
Revenue 9,635 9,023
Royalties    
Disaggregation of Revenue    
Revenue 408 428
Other revenue    
Disaggregation of Revenue    
Revenue $ 65 $ 575