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Stock-Based Compensation - Restricted Stock and Restricted Stock Units (Details) - Stock options and RSUs - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Stock-Based Compensation |  |  |  |
Allocated share-based compensation expense | $ 9.5 | $ 7.4 | $ 18.5 | $ 14.3
Research and development |  |  |  |
Stock-Based Compensation |  |  |  |
Allocated share-based compensation expense | 3.0 | 2.2 | 5.8 | 4.4
Selling, general and administrative |  |  |  |
Stock-Based Compensation |  |  |  |
Allocated share-based compensation expense | $ 6.5 | $ 5.2 | $ 12.7 | $ 9.9

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