Summary of Significant Accounting Policies - Additional Information (Details 1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01 $ in Millions	Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Revenue, unsatisfied performance obligation	$ 111.0
Performance obligation, expected timing of satisfaction, period	12 months