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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%

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