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
-Topic 825
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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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
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-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

Segment Information - Summary of Revenue by Major Customers (Details) - segment	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting [Abstract]
Number of operating segments	1
Customer Concentration Risk \| Sales Revenue, Net \| AmerisourceBergen Corp.
Revenue, Major Customer [Line Items]
Percentage of total revenues	20.00%	20.00%	20.00%	20.00%
Customer Concentration Risk \| Sales Revenue, Net \| Cardinal Health, Inc.
Revenue, Major Customer [Line Items]
Percentage of total revenues	21.00%	20.00%	21.00%	20.00%
Customer Concentration Risk \| Sales Revenue, Net \| McKesson Corp.
Revenue, Major Customer [Line Items]
Percentage of total revenues	20.00%	21.00%	20.00%	21.00%