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Accounting Policies - Percentage of Net Product Sales and Accounts Receivable Balance (Details) - Customer Concentration Risk | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2021
Revenue Benchmark |  |
Product Information [Line Items] |  |
Concentration risk percentage | 99.20% | 99.10%
Revenue Benchmark | Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage | 50.20% | 48.90%
Revenue Benchmark | Second Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage | 30.90% | 31.70%
Revenue Benchmark | Third Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage | 18.10% | 18.50%
Accounts Receivable |  |
Product Information [Line Items] |  |
Concentration risk percentage |  | 99.60%
Accounts Receivable | Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage |  | 48.90%
Accounts Receivable | Second Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage |  | 37.40%
Accounts Receivable | Third Largest Customer |  |
Product Information [Line Items] |  |
Concentration risk percentage |  | 13.30%

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