Accounting Policies - Percentage of Net Product Sales and Accounts Receivable Balance (Details) - Customer Concentration Risk	3 Months Ended
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%

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration