Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Recently Issued Accounting Pronouncements (Details)

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Summary of Significant Accounting Policies - Recently Issued Accounting Pronouncements (Details) - ASU 2016-02 - Forecast
$ in Millions
Jan. 01, 2019
USD ($)
Minimum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right of use assets $ 2.5
Lease liabilities 2.5
Maximum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right of use assets 3.5
Lease liabilities $ 3.5