Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - New Accounting Guidance (Details)

v3.19.1
Summary of Significant Accounting Policies - New Accounting Guidance (Details) - USD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2018
Scenario, Forecast | Accounting Standards Update 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Lease asset $ 60.0  
Lease liability 60.0  
Non-Employees Member | Payout Provision    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Fair value of the award as of the modification dates or grant date   $ 18.9
Non-Employees Member | Payout Provision | Scenario, Forecast | Accounting Standards Update 2018-07    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Fair value of the award as of the modification dates or grant date $ 18.9