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Revenues - Revenues Disaggregated by Significant Customer (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 225,397	$ 152,510	$ 625,224	$ 332,405
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%
Ipsen
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 57,186	$ 50,680	$ 145,038	$ 60,704
Ipsen | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	25.00%	33.00%	23.00%	18.00%
Caremark L.L.C.
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 30,707	$ 20,272	$ 83,516	$ 52,526
Caremark L.L.C. | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	14.00%	13.00%	13.00%	16.00%
Affiliates of McKesson Corporation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 26,597	$ 14,575	$ 71,249	$ 38,699
Affiliates of McKesson Corporation | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	12.00%	10.00%	11.00%	12.00%
Diplomat Specialty Pharmacy
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 17,946	$ 20,460	$ 56,568	$ 62,909
Diplomat Specialty Pharmacy | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	8.00%	13.00%	9.00%	19.00%
Accredo Health, Incorporated
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 20,677	$ 13,445	$ 58,677	$ 36,504
Accredo Health, Incorporated | Revenue | Customer Concentration Risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	9.00%	9.00%	9.00%	11.00%
Others, individually less than 10% of Total revenues for all periods presented
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 72,284	$ 33,078	$ 210,176	$ 81,063
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	32.00%	22.00%	35.00%	24.00%

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