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Realignment of Goals and Objectives and New Development Focus - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018
Restructuring and related cost, expected cost, total |  | $ 9.4
Restructuring Plan | General and Administrative Expense |  |
Restructuring charges, total | $ 0.5 |
Restructuring Plan | Employee Severance |  |
Restructuring and related cost, expected cost, total |  | 5.5
Restructuring Plan | Accelerated Non-Cash Stock Option Expense |  |
Restructuring and related cost, expected cost, total |  | $ 3.9

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