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Organization and Summary of Significant Accounting Policies (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($)
Organization and Business |  |  |  |  |
Number of operating segments | item |  | 1 |  |  |
Concentrations of Credit Risk |  |  |  |  |
Number of issuer to which company limits the amount of credit exposure other than US Government guaranteed securities | item |  | 1 |  |  |
Number of financial investment to which company limits the amount of credit exposure other than US Government guaranteed securities | item |  | 1 |  |  |
Impairment of Long-Lived Assets |  |  |  |  |
Write-off of the acquired IPR&D | $ 12,000 |  | $ 12,000 |  |
Revenue Recognition |  |  |  |  |
Accrued sales allowances |  | $ 44,800 | 34,700 |  |
Percentage of Medicare Part D insurance coverage gap mandate to be funded by manufacturers |  | 50.00% |  |  |
Research and development expense |  | $ 1,197,957 | 1,326,134 | $ 581,861 |
Accrued research and development costs |  | 98,600 | $ 110,000 |  |
ASU No. 2016-02 |  |  |  |  |
Recent Accounting Pronouncements |  |  |  |  |
Financing lease right-of-use assets |  | 26,000 |  |  |
Financing liability |  | $ 18,700 |  |  |
Calithera | ASU 2016-01 |  |  |  |  |
Recent Accounting Pronouncements |  |  |  |  |
Decrease in accumulated deficit |  |  |  |  | $ 2,800
JAKAFI |  |  |  |  |
Inventory |  |  |  |  |
Shelf life for finished goods inventory, maximum |  | 36 months |  |  |
ICLUSIG |  |  |  |  |
Inventory |  |  |  |  |
Shelf life for finished goods inventory, maximum |  | 24 months |  |  |
ICLUSIG | Licensed IP |  |  |  |  |
Revenue Recognition |  |  |  |  |
Amortization period |  | 12 years 6 months |  |  |

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