Changes in Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Lease	Jan. 01, 2019 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease, right-of-use asset	$ 1,233
Operating lease, liability	$ 1,304
ASC 842 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Number of operating leases for premises | Lease	1
Operating lease, right-of-use asset		$ 1,333
Operating lease, liability		1,453
ASC 842 [Member] | Accumulated Deficit [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative effect of accounting change adjustment		$ 175