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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
	Jun. 30, 2019	Jun. 30, 2019
Revenue Benchmark
Product Information [Line Items]
Concentration risk percentage	97.50%	97.60%
Revenue Benchmark | Largest Customer
Product Information [Line Items]
Concentration risk percentage	41.30%	41.00%
Revenue Benchmark | Second Largest Customer
Product Information [Line Items]
Concentration risk percentage	40.40%	38.70%
Revenue Benchmark | Third Largest Customer
Product Information [Line Items]
Concentration risk percentage	15.80%	17.90%
Accounts Receivable
Product Information [Line Items]
Concentration risk percentage		98.90%
Accounts Receivable | Largest Customer
Product Information [Line Items]
Concentration risk percentage		42.00%
Accounts Receivable | Second Largest Customer
Product Information [Line Items]
Concentration risk percentage		48.00%
Accounts Receivable | Third Largest Customer
Product Information [Line Items]
Concentration risk percentage		8.90%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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+ References

No definition available.

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