Revenues - Revenues from Major Customers (Details) - Revenue Benchmark - Customer Concentration Risk	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AmerisourceBergen Corporation
Revenue, Major Customer [Line Items]
Percentage of revenues	30.00%	21.00%	25.00%	21.00%
Cardinal Health, Inc.
Revenue, Major Customer [Line Items]
Percentage of revenues	19.00%	21.00%	22.00%	21.00%
McKesson Corporation
Revenue, Major Customer [Line Items]
Percentage of revenues	22.00%	23.00%	22.00%	21.00%

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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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