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Revenues - Revenues Disaggregated by Significant Customer (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 27, 2019
Sep. 28, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues $ 271,703 $ 225,397 $ 727,465 $ 625,224
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]        
Total revenues $ 76,016 $ 57,186 $ 120,133 $ 145,038
Ipsen | Revenue | Customer Concentration Risk        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Percent of total revenues 28.00% 25.00% 17.00% 23.00%
Caremark L.L.C.        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues $ 35,703 $ 30,707 $ 105,638 $ 83,516
Caremark L.L.C. | Revenue | Customer Concentration Risk        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Percent of total revenues 13.00% 14.00% 15.00% 13.00%
Affiliates of McKesson Corporation        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues $ 31,901 $ 26,597 $ 88,496 $ 71,249
Affiliates of McKesson Corporation | Revenue | Customer Concentration Risk        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Percent of total revenues 12.00% 12.00% 12.00% 11.00%
Affiliates of AmerisourceBergen Corporation        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues $ 25,235 $ 17,232 $ 70,503 $ 49,995
Affiliates of AmerisourceBergen Corporation | Revenue | Customer Concentration Risk        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Percent of total revenues 9.00% 8.00% 10.00% 8.00%
Others, individually less than 10% of Total revenues for all periods presented        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues $ 102,848 $ 93,675 $ 342,695 $ 275,426
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 38.00% 41.00% 46.00% 45.00%