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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Concentration Risk [Line Items] |  |
Allowance for doubtful accounts receivable | $ 0.2 |
Net product sales | Customer Concentration Risk | Customer One |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 24.00% | 25.00%
Accounts receivable | Customer Concentration Risk | Customer One |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 14.00% | 12.00%

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