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Summary of Significant Accounting Policies - Accounts Receivable, Net and Concentration of Credit Risk (Details) - Customer Concentration Risk
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Percentage of Net Product Sales | All Major Customers      
Accounts Receivable, Net      
Concentration risk percentage 86.00% 89.00% 98.00%
Percentage of Net Product Sales | Customer A      
Accounts Receivable, Net      
Concentration risk percentage 28.00% 29.00% 32.00%
Percentage of Net Product Sales | Customer B      
Accounts Receivable, Net      
Concentration risk percentage 29.00% 31.00% 32.00%
Percentage of Net Product Sales | Customer C      
Accounts Receivable, Net      
Concentration risk percentage 29.00% 29.00% 34.00%
Percentage of Accounts Receivable, net | All Major Customers      
Accounts Receivable, Net      
Concentration risk percentage 83.00% 85.00%  
Percentage of Accounts Receivable, net | Customer A      
Accounts Receivable, Net      
Concentration risk percentage 34.00% 31.00%  
Percentage of Accounts Receivable, net | Customer B      
Accounts Receivable, Net      
Concentration risk percentage 31.00% 32.00%  
Percentage of Accounts Receivable, net | Customer C      
Accounts Receivable, Net      
Concentration risk percentage 18.00% 22.00%