Basis of Presentation - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Leases
Operating lease right-of-use assets	$ 7,713
Operating lease liabilities	$ 8,857
ASU 2016-02
Leases
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]		true
ASU 2016-02 | Adjustments
Leases
Operating lease right-of-use assets		$ 9,200
Operating lease liabilities		$ 10,300