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Commitments and Contingencies - Defined Contribution Plan (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2018
Sep. 30, 2019
Sep. 30, 2019
Other Commitments [Line Items]      
Employer matching contribution (as a percent) 50.00%    
Company matching contribution   $ 0.2 $ 0.4
Maximum      
Other Commitments [Line Items]      
Maximum employee contribution 6.00%