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Accounting Policies - Percentage of Net Product Sales and Accounts Receivable Balance (Details) - Customer Concentration Risk | 3 Months Ended
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Mar. 31, 2020
Revenue Benchmark |
Product Information [Line Items] |
Concentration risk percentage | 98.40%
Revenue Benchmark | Largest Customer |
Product Information [Line Items] |
Concentration risk percentage | 40.70%
Revenue Benchmark | Second Largest Customer |
Product Information [Line Items] |
Concentration risk percentage | 36.70%
Revenue Benchmark | Third Largest Customer |
Product Information [Line Items] |
Concentration risk percentage | 21.00%
Accounts Receivable |
Product Information [Line Items] |
Concentration risk percentage | 99.30%
Accounts Receivable | Largest Customer |
Product Information [Line Items] |
Concentration risk percentage | 46.90%
Accounts Receivable | Second Largest Customer |
Product Information [Line Items] |
Concentration risk percentage | 41.40%
Accounts Receivable | Third Largest Customer |
Product Information [Line Items] |
Concentration risk percentage | 11.00%

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