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Revenue - Activities and Ending Reserve Balances for Each Significant Category of Discounts and Allowances (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Accounts Notes And Loans Receivable [Line Items]  
Balance at December 31, 2018 $ 0
Provisions related to sales made in, current period 30,724
Payments and customer credits issued (3,024)
Balance at March 31, 2019 27,700
Chargebacks and Discounts for Prompt Payment  
Accounts Notes And Loans Receivable [Line Items]  
Balance at December 31, 2018 0
Provisions related to sales made in, current period 17,513
Payments and customer credits issued (2,113)
Balance at March 31, 2019 15,400
Rebates  
Accounts Notes And Loans Receivable [Line Items]  
Balance at December 31, 2018 0
Provisions related to sales made in, current period 5,165
Payments and customer credits issued 0
Balance at March 31, 2019 5,165
Other Fees, Co-pay Assistance and Returns  
Accounts Notes And Loans Receivable [Line Items]  
Balance at December 31, 2018 0
Provisions related to sales made in, current period 8,046
Payments and customer credits issued (911)
Balance at March 31, 2019 $ 7,135