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