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Concentrations of Credit Risk (Revenues by Customer) (Details) - Customer Concentration Risk [Member] - Revenues [Member] | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Diplomat Specialty Pharmacy [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percentage) | 25.00% | 55.00%
Caremark L.L.C. [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percentage) | 17.00% | 0.00%
Affiliates of McKesson Corporation [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percentage) | 14.00% | 0.00%
Accredo Health, Incorporated [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percentage) | 12.00% | 0.00%
Merck [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percentage) | 0.00% | 32.00%

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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 + Details
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