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
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-URI http://asc.fasb.org/extlink&oid=109250915&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
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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

Summary of Significant Accounting Policies - Major Customers as a Percentage (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Revenues
Concentration Risk [Line Items]
Percentage of concentration	100.00%	100.00%	100.00%
Net Revenues \| Cephalon, Inc.
Concentration Risk [Line Items]
Percentage of concentration	75.00%	79.00%	79.00%
Net Revenues \| Other
Concentration Risk [Line Items]
Percentage of concentration	25.00%	21.00%	21.00%
Accounts Receivable
Concentration Risk [Line Items]
Percentage of concentration	100.00%	100.00%
Accounts Receivable \| Cephalon, Inc.
Concentration Risk [Line Items]
Percentage of concentration	61.00%	74.00%
Accounts Receivable \| Other
Concentration Risk [Line Items]
Percentage of concentration	39.00%	26.00%