Commitments and Contingencies - Defined Contribution Plan (Details) - USD ($) $ in Millions |
1 Months Ended | 12 Months Ended |
|---|---|---|
Jan. 31, 2018 |
Dec. 31, 2018 |
|
| Commitments and Contingencies | ||
| Employer matching contribution (as a percent) | 50.00% | |
| Percentage of employee's gross pay match | 6.00% | |
| Company matching contribution | $ 0.2 |