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Accounting Policies - Percentage of Net Product Sales and Accounts Receivable Balance (Details) - Customer Concentration Risk
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Revenue Benchmark    
Product Information [Line Items]    
Concentration risk percentage 98.20% 98.30%
Revenue Benchmark | Largest Customer    
Product Information [Line Items]    
Concentration risk percentage 43.30% 42.80%
Revenue Benchmark | Second Largest Customer    
Product Information [Line Items]    
Concentration risk percentage 32.10% 33.80%
Revenue Benchmark | Third Largest Customer    
Product Information [Line Items]    
Concentration risk percentage 22.80% 21.70%
Accounts Receivable    
Product Information [Line Items]    
Concentration risk percentage   99.00%
Accounts Receivable | Largest Customer    
Product Information [Line Items]    
Concentration risk percentage   53.90%
Accounts Receivable | Second Largest Customer    
Product Information [Line Items]    
Concentration risk percentage   32.30%
Accounts Receivable | Third Largest Customer    
Product Information [Line Items]    
Concentration risk percentage   12.80%