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Concentrations of Credit Risk (Revenues by Customer) (Details) - Customer Concentration Risk [Member] - Revenues [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Diplomat Specialty Pharmacy [Member]
Concentration Risk [Line Items]
Concentration risk (as a percentage)	23.00%	52.00%	24.00%	53.00%
Caremark L.L.C. [Member]
Concentration Risk [Line Items]
Concentration risk (as a percentage)	19.00%	9.00%	18.00%	6.00%
Accredo Health, Incorporated [Member]
Concentration Risk [Line Items]
Concentration risk (as a percentage)	14.00%	7.00%	13.00%	5.00%
Affiliates of McKesson Corporation [Member]
Concentration Risk [Line Items]
Concentration risk (as a percentage)	13.00%	6.00%	13.00%	4.00%
Merck [Member]
Concentration Risk [Line Items]
Concentration risk (as a percentage)	0.00%	0.00%	0.00%	10.00%

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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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- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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