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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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