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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, 2019	Sep. 30, 2019
Revenue Benchmark
Product Information [Line Items]
Concentration risk percentage	98.00%	97.80%
Revenue Benchmark | Largest Customer
Product Information [Line Items]
Concentration risk percentage	46.80%	41.90%
Revenue Benchmark | Second Largest Customer
Product Information [Line Items]
Concentration risk percentage	36.90%	39.40%
Revenue Benchmark | Third Largest Customer
Product Information [Line Items]
Concentration risk percentage	14.30%	16.50%
Accounts Receivable
Product Information [Line Items]
Concentration risk percentage		99.00%
Accounts Receivable | Largest Customer
Product Information [Line Items]
Concentration risk percentage		55.90%
Accounts Receivable | Second Largest Customer
Product Information [Line Items]
Concentration risk percentage		37.00%
Accounts Receivable | Third Largest Customer
Product Information [Line Items]
Concentration risk percentage		6.10%

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
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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