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Revenues (Revenues Disaggregated by Significant Customer) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 228,602 | $ 225,397 | $ 186,108 | $ 213,719 | $ 120,072 | $ 152,510 | $ 99,008 | $ 80,887 | $ 853,826 | $ 452,477 | $ 191,454
Sales revenue, net | Customer concentration risk |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of total |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Ipsen |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 182,879 | $ 69,792 | $ 33,252
Ipsen | Sales revenue, net | Customer concentration risk |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of total |  |  |  |  |  |  |  |  | 21.00% | 15.00% | 17.00%
Caremark L.L.C. |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 110,698 | $ 73,921 | $ 17,746
Caremark L.L.C. | Sales revenue, net | Customer concentration risk |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of total |  |  |  |  |  |  |  |  | 13.00% | 16.00% | 9.00%
Affiliates of McKesson Corporation |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 99,916 | $ 48,662 | $ 13,143
Affiliates of McKesson Corporation | Sales revenue, net | Customer concentration risk |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of total |  |  |  |  |  |  |  |  | 12.00% | 11.00% | 7.00%
Accredo Health, Incorporated |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 81,028 | $ 50,716 | $ 16,631
Accredo Health, Incorporated | Sales revenue, net | Customer concentration risk |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of total |  |  |  |  |  |  |  |  | 9.00% | 11.00% | 9.00%
Diplomat Specialty Pharmacy |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 74,244 | $ 83,059 | $ 63,826
Diplomat Specialty Pharmacy | Sales revenue, net | Customer concentration risk |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of total |  |  |  |  |  |  |  |  | 9.00% | 18.00% | 33.00%
Others, individually less than 10% of Total revenues for all periods presented |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 305,061 | $ 126,327 | $ 46,856
Others, individually less than 10% of Total revenues for all periods presented | Sales revenue, net | Customer concentration risk |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of total |  |  |  |  |  |  |  |  | 36.00% | 29.00% | 25.00%

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