Selected Balance Sheet Accounts (Details 3) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Selected Balance Sheet Accounts [Abstract]
Accrued employee-related benefits	$ 3,125	$ 2,411
Other accrued expenses and other current liabilities:
Accrued traffic acquisition costs	6,971	5,952
Other accrued expenses	1,040	355
Amounts due to customers	423	438
Other current liabilities	434	507
Total other accrued expenses and other current liabilities	8,868	7,252
Total accrued expenses and other current liabilities	$ 11,993	$ 9,663