Accounts Payable, Accrued Expenses and Other Current Liabilities (Schedule of Accounts Payable, Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts Payable Accrued Expenses And Other Current Liabilities [Line Items]
Accounts payable	$ 3,825	$ 3,362
Accrued expenses	1,704	3,160
Accrued compensation	1,126	1,074
Tax related liabilities	719	615
Gift certificates and loyalty reward program liabilities	674	474
Other	84	51
Total accounts payable, accrued expenses and other current liabilities	$ 8,132	$ 8,736