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Nature of Business and Basis of Presentation - Additional Information (Detail) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 Employee | Sep. 30, 2019 USD ($) Patient Employee Segment | Dec. 31, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
REDUCE-IT study, number of patients enrolled and randomized | Patient |  | 8,179 |
Number of sales professionals | Employee |  | 400 |
Number of operating segments | Segment |  | 1 |
Total current assets |  | $ 848,110,000 | $ 377,997,000
Cash and cash equivalents |  | 673,207,000 | 249,227,000
Accounts receivable, net |  | 103,583,000 | 66,523,000
Inventory |  | 54,557,000 | $ 57,802,000
Other debt outstanding |  | $ 0 |
Sales Representatives and Managers |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
Number of sales professionals | Employee | 170 | 440 |
Sales Representatives |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
Number of sales professionals | Employee |  | 400 |
Direct Sales Force |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
Number of sales professionals | Employee |  | 800 |

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