Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Defined Contribution Plan (Details)

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Commitments and Contingencies - Defined Contribution Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]    
Defined contribution plan, maximum annual contributions per employee, percent 92.00%  
Defined benefit plan, employer matching contribution, percent of match (up to) 3.00%  
Defined benefit plan, contributions by employer $ 3.3 $ 5.6