Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	Mar. 31, 2019 state	Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of states in which entity operates | state	50
Discount rate	6.75%
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset		$ 3.8
Lease liability		$ 3.9
Affiliate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Ownership percentage	50.00%
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease term	5 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease term	10 years