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Revenues - Revenues Disaggregated by Significant Customer (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 240,275	$ 186,108	$ 455,762	$ 399,827
Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	100.00%	100.00%	100.00%	100.00%
Caremark L.L.C.
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 37,237	$ 26,421	$ 69,935	$ 52,809
Caremark L.L.C. | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	15.00%	14.00%	15.00%	13.00%
Affiliates of McKesson Corporation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 31,284	$ 23,321	$ 56,595	$ 44,652
Affiliates of McKesson Corporation | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	13.00%	13.00%	12.00%	11.00%
Affiliates of AmerisourceBergen Corporation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 23,366	$ 17,028	$ 45,268	$ 32,763
Affiliates of AmerisourceBergen Corporation | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	10.00%	9.00%	10.00%	8.00%
Ipsen
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 22,249	$ 34,043	$ 44,117	$ 87,852
Ipsen | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	9.00%	18.00%	10.00%	22.00%
Accredo Health, Incorporated
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 18,688	$ 19,714	$ 41,183	$ 38,000
Accredo Health, Incorporated | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	8.00%	11.00%	9.00%	10.00%
Diplomat Specialty Pharmacy
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 15,318	$ 18,475	$ 27,557	$ 38,622
Diplomat Specialty Pharmacy | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	6.00%	10.00%	6.00%	10.00%
Others, individually less than 10% of Total revenues for all periods presented
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 92,133	$ 47,106	$ 171,107	$ 105,129
Others, individually less than 10% of Total revenues for all periods presented | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	39.00%	25.00%	38.00%	26.00%

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