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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
May 12, 2020 | May 15, 2018 | Jun. 30, 2020 | May 16, 2019
Stock-Based Compensation |  |  |  |
Inducement stock options granted to new employees (in shares) |  |  | 662,410 |
Common stock options |  |  |  |
Stock-Based Compensation |  |  |  |
Unrecognized compensation expense related to unvested stock options |  |  | $ 66.9 |
Expected weighted average period for recognized and unrecognized compensation expense |  |  | 2 years 6 months |
Performance options |  |  |  |
Stock-Based Compensation |  |  |  |
Options outstanding (in shares) |  |  | 0 |
Unvested restricted stock and RSUs |  |  |  |
Stock-Based Compensation |  |  |  |
Expected weighted average period for recognized and unrecognized compensation expense |  |  | 2 years 9 months 18 days |
Unrecognized compensation expense related to unvested RSU awards |  |  | $ 19.2 |
2019 Incentive Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Shares of common stock, maximum authorized for issuance (in shares) |  |  |  | 3,500,000
Number of additional shares authorized (in shares) | 4,500,000 |  |  |
Shares available for grant (in shares) |  |  | 5,176,799 |
2018 Employee Stock Purchase Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Shares of common stock, maximum authorized for issuance (in shares) |  | 1,000,000 |  |
Number of additional shares authorized (in shares) |  | 1,200,000 |  |
Percentage of outstanding shares |  | 2.00% |  |

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