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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, 2021 | Sep. 30, 2021
Revenue Benchmark | Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage | 41.40% | 46.40%
Revenue Benchmark | Second Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage | 37.60% | 33.70%
Revenue Benchmark | Third Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage | 19.40% | 18.80%
Revenue Benchmark | Top Three Customers |  |
Product Information [Line Items] |  |
Concentration risk percentage | 98.40% | 98.90%
Accounts Receivable | Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage |  | 40.30%
Accounts Receivable | Second Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage |  | 46.60%
Accounts Receivable | Third Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage |  | 12.00%
Accounts Receivable | Top Three Customers |  |
Product Information [Line Items] |  |
Concentration risk percentage |  | 98.90%

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