Income Taxes - Schedule of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Components Of Deferred Tax Assets And Liabilities [Abstract]
Deferred rent	$ 133	$ 47
AMT credit	9	31
Accrued expenses	1,474	1,091
Deferred revenue	292	441
Net operating loss carryforward	14,957	18,722
Other assets	1,643	423
Intangible assets	(2,210)	(2,173)
Property and equipment	(190)	(166)
Other liabilities		(28)
Valuation allowance	(16,590)	(18,882)
Total non-current deferred income tax liabilities	$ (482)	$ (494)