Significant Accounting Policies - Recently Issued Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
New accounting pronouncements or change in accounting principle
Lease, Practical Expedients, Package [true false]	true
Operating lease, right-of use assets	$ 344
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets..
Operating lease liabilities	$ 344
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities.
ASU 2016-02 | Adjustment
New accounting pronouncements or change in accounting principle
Operating lease, right-of use assets		$ 400
Operating lease liabilities		$ 400