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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accounting Policies [Abstract]    
Allowance for doubtful accounts receivable $ 100  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net product sales 60,525 $ 34,046
U.S.    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net product sales 17,772 9,068
Ex-U.S.    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net product sales $ 42,753 $ 24,978