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Revenue from Product Sales - Schedule of Net Product Sales (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Revenue From Contract With Customer [Abstract]      
Revenue from Contract with Customer, Product and Service [Extensible List] urgn:JelmytoMember urgn:JelmytoMember  
Revenues $ 3,461 $ 3,833 $ 18