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Revenues - Revenues Disaggregated by Significant Customer (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 212,346	$ 80,887
Ipsen
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 53,809	$ 4,530
Ipsen | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	25.00%	6.00%
Caremark L.L.C.
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 26,388	$ 13,819
Caremark L.L.C. | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	12.00%	17.00%
Affiliates of McKesson Corporation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 21,331	$ 11,278
Affiliates of McKesson Corporation | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	10.00%	14.00%
Diplomat Specialty Pharmacy
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 20,147	$ 19,850
Diplomat Specialty Pharmacy | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	9.00%	25.00%
Accredo Health, Incorporated
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 18,286	$ 9,440
Accredo Health, Incorporated | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	9.00%	12.00%

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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=84177426&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=77997519&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=84177426&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=77997519&loc=d3e13537-108611

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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