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DESCRIPTION OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Related Party Transactions (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Related Parties |  |
Investments in related party | $ 0.0 |
GSK |  |
Related Parties |  |
Percentage of common stock owned | 31.40% |
BlackRock, Inc |  |
Related Parties |  |
Investments in related party |  | $ 64.3
BlackRock, Inc | Minimum |  |
Related Parties |  |
Percentage of common stock owned | 10.00% |

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